diff --git a/test/absolute_test.c b/test/absolute_test.c
index 9f646c1..a0feaa9 100755
--- a/test/absolute_test.c
+++ b/test/absolute_test.c
@@ -6,7 +6,7 @@
 
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 
-int absolute_check()
+int absolute_check(void)
 {
   const char *relative_paths[] = {"..", "test", "test/test", "../another_test",
     "./simple", ".././simple"};
@@ -31,7 +31,7 @@ int absolute_check()
   return EXIT_SUCCESS;
 }
 
-int absolute_too_far()
+int absolute_too_far(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -51,7 +51,7 @@ int absolute_too_far()
   return EXIT_SUCCESS;
 }
 
-int absolute_normalization()
+int absolute_normalization(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -71,7 +71,7 @@ int absolute_normalization()
   return EXIT_SUCCESS;
 }
 
-int absolute_mixed()
+int absolute_mixed(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -91,7 +91,7 @@ int absolute_mixed()
   return EXIT_SUCCESS;
 }
 
-int absolute_unix_relative_base()
+int absolute_unix_relative_base(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -110,7 +110,7 @@ int absolute_unix_relative_base()
   return EXIT_SUCCESS;
 }
 
-int absolute_windows_relative_base()
+int absolute_windows_relative_base(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -129,7 +129,7 @@ int absolute_windows_relative_base()
   return EXIT_SUCCESS;
 }
 
-int absolute_absolute_path()
+int absolute_absolute_path(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -149,7 +149,7 @@ int absolute_absolute_path()
   return EXIT_SUCCESS;
 }
 
-int absolute_simple()
+int absolute_simple(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -169,7 +169,7 @@ int absolute_simple()
 }
 
 
-int absolute_buffer_reuse()
+int absolute_buffer_reuse(void)
 {
   char path[FILENAME_MAX];
 
diff --git a/test/basename_test.c b/test/basename_test.c
index a45c2aa..5a6a291 100755
--- a/test/basename_test.c
+++ b/test/basename_test.c
@@ -4,7 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int basename_change_trim_only_root()
+int basename_change_trim_only_root(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -24,7 +24,7 @@ int basename_change_trim_only_root()
   return EXIT_SUCCESS;
 }
 
-int basename_change_trim()
+int basename_change_trim(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -44,7 +44,7 @@ int basename_change_trim()
   return EXIT_SUCCESS;
 }
 
-int basename_change_relative()
+int basename_change_relative(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -64,7 +64,7 @@ int basename_change_relative()
   return EXIT_SUCCESS;
 }
 
-int basename_change_empty_basename()
+int basename_change_empty_basename(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -83,7 +83,7 @@ int basename_change_empty_basename()
   return EXIT_SUCCESS;
 }
 
-int basename_change_only_root()
+int basename_change_only_root(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -102,7 +102,7 @@ int basename_change_only_root()
   return EXIT_SUCCESS;
 }
 
-int basename_change_empty_path()
+int basename_change_empty_path(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -121,7 +121,7 @@ int basename_change_empty_path()
   return EXIT_SUCCESS;
 }
 
-int basename_change_simple()
+int basename_change_simple(void)
 {
   size_t n;
   char buffer[FILENAME_MAX];
@@ -141,7 +141,7 @@ int basename_change_simple()
   return EXIT_SUCCESS;
 }
 
-int basename_windows()
+int basename_windows(void)
 {
   const char *path, *basename;
   size_t length;
@@ -161,7 +161,7 @@ int basename_windows()
   return EXIT_SUCCESS;
 }
 
-int basename_root()
+int basename_root(void)
 {
   const char *path, *basename;
   size_t length;
@@ -181,7 +181,7 @@ int basename_root()
   return EXIT_SUCCESS;
 }
 
-int basename_special_directories()
+int basename_special_directories(void)
 {
   const char *path, *basename;
   size_t length;
@@ -212,7 +212,7 @@ int basename_special_directories()
   return EXIT_SUCCESS;
 }
 
-int basename_no_separators()
+int basename_no_separators(void)
 {
   const char *path, *basename;
   size_t length;
@@ -232,7 +232,7 @@ int basename_no_separators()
   return EXIT_SUCCESS;
 }
 
-int basename_trailing_separators()
+int basename_trailing_separators(void)
 {
   const char *path, *basename;
   size_t length;
@@ -252,7 +252,7 @@ int basename_trailing_separators()
   return EXIT_SUCCESS;
 }
 
-int basename_trailing_separator()
+int basename_trailing_separator(void)
 {
   const char *path, *basename;
   size_t length;
@@ -272,7 +272,7 @@ int basename_trailing_separator()
   return EXIT_SUCCESS;
 }
 
-int basename_empty()
+int basename_empty(void)
 {
   const char *path, *basename;
   size_t length;
@@ -292,7 +292,7 @@ int basename_empty()
   return EXIT_SUCCESS;
 }
 
-int basename_simple()
+int basename_simple(void)
 {
   const char *path, *basename;
   size_t length;
diff --git a/test/dirname_test.c b/test/dirname_test.c
index 9a14200..042cfef 100755
--- a/test/dirname_test.c
+++ b/test/dirname_test.c
@@ -2,7 +2,7 @@
 #include <memory.h>
 #include <stdlib.h>
 
-int dirname_relative()
+int dirname_relative(void)
 {
   const char *path;
   size_t length;
@@ -18,7 +18,7 @@ int dirname_relative()
   return EXIT_SUCCESS;
 }
 
-int dirname_three_segments()
+int dirname_three_segments(void)
 {
   const char *path;
   size_t length;
@@ -34,7 +34,7 @@ int dirname_three_segments()
   return EXIT_SUCCESS;
 }
 
-int dirname_root()
+int dirname_root(void)
 {
   const char *path;
   size_t length;
@@ -50,7 +50,7 @@ int dirname_root()
   return EXIT_SUCCESS;
 }
 
-int dirname_special_directories()
+int dirname_special_directories(void)
 {
   const char *path;
   size_t length;
@@ -73,7 +73,7 @@ int dirname_special_directories()
   return EXIT_SUCCESS;
 }
 
-int dirname_no_separators()
+int dirname_no_separators(void)
 {
   const char *path;
   size_t length;
@@ -89,7 +89,7 @@ int dirname_no_separators()
   return EXIT_SUCCESS;
 }
 
-int dirname_trailing_separators()
+int dirname_trailing_separators(void)
 {
   const char *path;
   size_t length;
@@ -105,7 +105,7 @@ int dirname_trailing_separators()
   return EXIT_SUCCESS;
 }
 
-int dirname_trailing_separator()
+int dirname_trailing_separator(void)
 {
   const char *path;
   size_t length;
@@ -121,7 +121,7 @@ int dirname_trailing_separator()
   return EXIT_SUCCESS;
 }
 
-int dirname_empty()
+int dirname_empty(void)
 {
   const char *path;
   size_t length;
@@ -137,7 +137,7 @@ int dirname_empty()
   return EXIT_SUCCESS;
 }
 
-int dirname_simple()
+int dirname_simple(void)
 {
   const char *path;
   size_t length;
diff --git a/test/extension_test.c b/test/extension_test.c
index df06583..0e67de3 100755
--- a/test/extension_test.c
+++ b/test/extension_test.c
@@ -4,7 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int extension_change_with_trailing_slash()
+int extension_change_with_trailing_slash(void)
 {
   char buffer[FILENAME_MAX] = "/folder/file.txt/";
   size_t n;
@@ -23,7 +23,7 @@ int extension_change_with_trailing_slash()
   return EXIT_SUCCESS;
 }
 
-int extension_change_hidden_file()
+int extension_change_hidden_file(void)
 {
   char buffer[FILENAME_MAX] = "/folder/.hidden_file.txt";
   size_t n;
@@ -42,7 +42,7 @@ int extension_change_hidden_file()
   return EXIT_SUCCESS;
 }
 
-int extension_change_overlap_long()
+int extension_change_overlap_long(void)
 {
   char buffer[FILENAME_MAX] = "/test.txt/";
   size_t n;
@@ -61,7 +61,7 @@ int extension_change_overlap_long()
   return EXIT_SUCCESS;
 }
 
-int extension_change_overlap()
+int extension_change_overlap(void)
 {
   char buffer[FILENAME_MAX] = "/test.txt/";
   size_t n;
@@ -80,7 +80,7 @@ int extension_change_overlap()
   return EXIT_SUCCESS;
 }
 
-int extension_change_with_dot()
+int extension_change_with_dot(void)
 {
   char buffer[FILENAME_MAX];
   size_t n;
@@ -99,7 +99,7 @@ int extension_change_with_dot()
   return EXIT_SUCCESS;
 }
 
-int extension_change_remove()
+int extension_change_remove(void)
 {
   char buffer[FILENAME_MAX];
   size_t n;
@@ -118,7 +118,7 @@ int extension_change_remove()
   return EXIT_SUCCESS;
 }
 
-int extension_change_no_extension()
+int extension_change_no_extension(void)
 {
   char buffer[FILENAME_MAX] = "C:\\file";
   size_t n;
@@ -137,7 +137,7 @@ int extension_change_no_extension()
   return EXIT_SUCCESS;
 }
 
-int extension_change_no_basename()
+int extension_change_no_basename(void)
 {
   char buffer[FILENAME_MAX] = "C:\\";
   size_t n;
@@ -156,7 +156,7 @@ int extension_change_no_basename()
   return EXIT_SUCCESS;
 }
 
-int extension_change_simple()
+int extension_change_simple(void)
 {
   char buffer[FILENAME_MAX];
   size_t n;
@@ -175,7 +175,7 @@ int extension_change_simple()
   return EXIT_SUCCESS;
 }
 
-int extension_check_without()
+int extension_check_without(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_has_extension("/my/path")) {
@@ -185,7 +185,7 @@ int extension_check_without()
   return EXIT_SUCCESS;
 }
 
-int extension_check_empty()
+int extension_check_empty(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_has_extension("")) {
@@ -195,7 +195,7 @@ int extension_check_empty()
   return EXIT_SUCCESS;
 }
 
-int extension_check_simple()
+int extension_check_simple(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (!cwk_path_has_extension("/my/path.txt")) {
@@ -205,7 +205,7 @@ int extension_check_simple()
   return EXIT_SUCCESS;
 }
 
-int extension_get_multiple()
+int extension_get_multiple(void)
 {
   const char *path, *extension;
   size_t length;
@@ -227,7 +227,7 @@ int extension_get_multiple()
   return EXIT_SUCCESS;
 }
 
-int extension_get_last()
+int extension_get_last(void)
 {
   const char *path, *extension;
   size_t length;
@@ -249,7 +249,7 @@ int extension_get_last()
   return EXIT_SUCCESS;
 }
 
-int extension_get_first()
+int extension_get_first(void)
 {
   const char *path, *extension;
   size_t length;
@@ -271,7 +271,7 @@ int extension_get_first()
   return EXIT_SUCCESS;
 }
 
-int extension_get_without()
+int extension_get_without(void)
 {
   const char *path, *extension;
   size_t length;
@@ -285,7 +285,7 @@ int extension_get_without()
   return EXIT_SUCCESS;
 }
 
-int extension_get_simple()
+int extension_get_simple(void)
 {
   const char *path, *extension;
   size_t length;
diff --git a/test/guess_test.c b/test/guess_test.c
index 6be6446..9815a32 100644
--- a/test/guess_test.c
+++ b/test/guess_test.c
@@ -1,7 +1,7 @@
 #include <cwalk.h>
 #include <stdlib.h>
 
-int guess_empty_string()
+int guess_empty_string(void)
 {
   if (cwk_path_guess_style("") != CWK_STYLE_UNIX) {
     return EXIT_FAILURE;
@@ -10,7 +10,7 @@ int guess_empty_string()
   return EXIT_SUCCESS;
 }
 
-int guess_unguessable()
+int guess_unguessable(void)
 {
   if (cwk_path_guess_style("myfile") != CWK_STYLE_UNIX) {
     return EXIT_FAILURE;
@@ -19,7 +19,7 @@ int guess_unguessable()
   return EXIT_SUCCESS;
 }
 
-int guess_extension()
+int guess_extension(void)
 {
   if (cwk_path_guess_style("myfile.txt") != CWK_STYLE_WINDOWS) {
     return EXIT_FAILURE;
@@ -32,7 +32,7 @@ int guess_extension()
   return EXIT_SUCCESS;
 }
 
-int guess_hidden_file()
+int guess_hidden_file(void)
 {
   if (cwk_path_guess_style(".my_hidden_file") != CWK_STYLE_UNIX) {
     return EXIT_FAILURE;
@@ -45,7 +45,7 @@ int guess_hidden_file()
   return EXIT_SUCCESS;
 }
 
-int guess_unix_separator()
+int guess_unix_separator(void)
 {
   if (cwk_path_guess_style("/directory/other") != CWK_STYLE_UNIX) {
     return EXIT_FAILURE;
@@ -58,7 +58,7 @@ int guess_unix_separator()
   return EXIT_SUCCESS;
 }
 
-int guess_windows_separator()
+int guess_windows_separator(void)
 {
   if (cwk_path_guess_style("\\directory\\other") != CWK_STYLE_WINDOWS) {
     return EXIT_FAILURE;
@@ -70,7 +70,7 @@ int guess_windows_separator()
   return EXIT_SUCCESS;
 }
 
-int guess_unix_root()
+int guess_unix_root(void)
 {
   if (cwk_path_guess_style("/directory") != CWK_STYLE_UNIX) {
     return EXIT_FAILURE;
@@ -79,7 +79,7 @@ int guess_unix_root()
   return EXIT_SUCCESS;
 }
 
-int guess_windows_root()
+int guess_windows_root(void)
 {
   if (cwk_path_guess_style("C:\\test") != CWK_STYLE_WINDOWS) {
     return EXIT_FAILURE;
diff --git a/test/intersection_test.c b/test/intersection_test.c
index 0bfdae8..cd7ca36 100755
--- a/test/intersection_test.c
+++ b/test/intersection_test.c
@@ -1,7 +1,7 @@
 #include <cwalk.h>
 #include <stdlib.h>
 
-int intersection_skipped_end()
+int intersection_skipped_end(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -12,7 +12,7 @@ int intersection_skipped_end()
   return EXIT_SUCCESS;
 }
 
-int intersection_relative_other()
+int intersection_relative_other(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -23,7 +23,7 @@ int intersection_relative_other()
   return EXIT_SUCCESS;
 }
 
-int intersection_relative_base()
+int intersection_relative_base(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -35,7 +35,7 @@ int intersection_relative_base()
   return EXIT_SUCCESS;
 }
 
-int intersection_one_root_only()
+int intersection_one_root_only(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -46,7 +46,7 @@ int intersection_one_root_only()
   return EXIT_SUCCESS;
 }
 
-int intersection_same_roots()
+int intersection_same_roots(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -57,7 +57,7 @@ int intersection_same_roots()
   return EXIT_SUCCESS;
 }
 
-int intersection_relative_absolute_mix()
+int intersection_relative_absolute_mix(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -68,7 +68,7 @@ int intersection_relative_absolute_mix()
   return EXIT_SUCCESS;
 }
 
-int intersection_unequal_roots()
+int intersection_unequal_roots(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -79,7 +79,7 @@ int intersection_unequal_roots()
   return EXIT_SUCCESS;
 }
 
-int intersection_empty()
+int intersection_empty(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -90,7 +90,7 @@ int intersection_empty()
   return EXIT_SUCCESS;
 }
 
-int intersection_double_separator()
+int intersection_double_separator(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_get_intersection("/this///is/a//test", "/this//is/a///file") !=
@@ -101,7 +101,7 @@ int intersection_double_separator()
   return EXIT_SUCCESS;
 }
 
-int intersection_trailing_separator()
+int intersection_trailing_separator(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_get_intersection("/this/is/a/test", "/this/is/a/") != 10) {
@@ -111,7 +111,7 @@ int intersection_trailing_separator()
   return EXIT_SUCCESS;
 }
 
-int intersection_truncated()
+int intersection_truncated(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_get_intersection("/this/is/a/test", "/this/is/a") != 10) {
@@ -121,7 +121,7 @@ int intersection_truncated()
   return EXIT_SUCCESS;
 }
 
-int intersection_simple()
+int intersection_simple(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_get_intersection("/this/is/a/test", "/this/is/a/string") != 10) {
diff --git a/test/is_absolute_test.c b/test/is_absolute_test.c
index 4bcc528..f20d437 100755
--- a/test/is_absolute_test.c
+++ b/test/is_absolute_test.c
@@ -1,7 +1,7 @@
 #include <cwalk.h>
 #include <stdlib.h>
 
-int is_absolute_relative_windows()
+int is_absolute_relative_windows(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -12,7 +12,7 @@ int is_absolute_relative_windows()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_relative_drive()
+int is_absolute_relative_drive(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -23,7 +23,7 @@ int is_absolute_relative_drive()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_device_question_mark()
+int is_absolute_device_question_mark(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -34,7 +34,7 @@ int is_absolute_device_question_mark()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_device_dot()
+int is_absolute_device_dot(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
   cwk_path_is_absolute("\\\\.\\mydevice\\test");
@@ -46,7 +46,7 @@ int is_absolute_device_dot()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_device_unc()
+int is_absolute_device_unc(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -57,7 +57,7 @@ int is_absolute_device_unc()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_unc()
+int is_absolute_unc(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -68,7 +68,7 @@ int is_absolute_unc()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_absolute_drive()
+int is_absolute_absolute_drive(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -79,7 +79,7 @@ int is_absolute_absolute_drive()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_unix_drive()
+int is_absolute_unix_drive(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -90,7 +90,7 @@ int is_absolute_unix_drive()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_unix_backslash()
+int is_absolute_unix_backslash(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -101,7 +101,7 @@ int is_absolute_unix_backslash()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_windows_slash()
+int is_absolute_windows_slash(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -112,7 +112,7 @@ int is_absolute_windows_slash()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_windows_backslash()
+int is_absolute_windows_backslash(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -123,7 +123,7 @@ int is_absolute_windows_backslash()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_relative()
+int is_absolute_relative(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -134,7 +134,7 @@ int is_absolute_relative()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_absolute()
+int is_absolute_absolute(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (!cwk_path_is_absolute("/test.txt")) {
@@ -144,7 +144,7 @@ int is_absolute_absolute()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_root()
+int is_absolute_root(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (!cwk_path_is_absolute("/")) {
@@ -154,7 +154,7 @@ int is_absolute_root()
   return EXIT_SUCCESS;
 }
 
-int is_absolute_dir()
+int is_absolute_dir(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (!cwk_path_is_absolute("/dir")) {
diff --git a/test/is_relative_test.c b/test/is_relative_test.c
index 569570f..7abf849 100755
--- a/test/is_relative_test.c
+++ b/test/is_relative_test.c
@@ -1,7 +1,7 @@
 #include <cwalk.h>
 #include <stdlib.h>
 
-int is_relative_relative_windows()
+int is_relative_relative_windows(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -12,7 +12,7 @@ int is_relative_relative_windows()
   return EXIT_SUCCESS;
 }
 
-int is_relative_relative_drive()
+int is_relative_relative_drive(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -23,7 +23,7 @@ int is_relative_relative_drive()
   return EXIT_SUCCESS;
 }
 
-int is_relative_device_question_mark()
+int is_relative_device_question_mark(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -34,7 +34,7 @@ int is_relative_device_question_mark()
   return EXIT_SUCCESS;
 }
 
-int is_relative_device_dot()
+int is_relative_device_dot(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
   cwk_path_is_absolute("\\\\.\\mydevice\\test");
@@ -46,7 +46,7 @@ int is_relative_device_dot()
   return EXIT_SUCCESS;
 }
 
-int is_relative_device_unc()
+int is_relative_device_unc(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -57,7 +57,7 @@ int is_relative_device_unc()
   return EXIT_SUCCESS;
 }
 
-int is_relative_unc()
+int is_relative_unc(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -68,7 +68,7 @@ int is_relative_unc()
   return EXIT_SUCCESS;
 }
 
-int is_relative_absolute_drive()
+int is_relative_absolute_drive(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -79,7 +79,7 @@ int is_relative_absolute_drive()
   return EXIT_SUCCESS;
 }
 
-int is_relative_unix_drive()
+int is_relative_unix_drive(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -90,7 +90,7 @@ int is_relative_unix_drive()
   return EXIT_SUCCESS;
 }
 
-int is_relative_unix_backslash()
+int is_relative_unix_backslash(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -101,7 +101,7 @@ int is_relative_unix_backslash()
   return EXIT_SUCCESS;
 }
 
-int is_relative_windows_slash()
+int is_relative_windows_slash(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -112,7 +112,7 @@ int is_relative_windows_slash()
   return EXIT_SUCCESS;
 }
 
-int is_relative_windows_backslash()
+int is_relative_windows_backslash(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -123,7 +123,7 @@ int is_relative_windows_backslash()
   return EXIT_SUCCESS;
 }
 
-int is_relative_relative()
+int is_relative_relative(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
 
@@ -134,7 +134,7 @@ int is_relative_relative()
   return EXIT_SUCCESS;
 }
 
-int is_relative_absolute()
+int is_relative_absolute(void)
 {
   cwk_path_set_style(CWK_STYLE_UNIX);
   if (cwk_path_is_relative("/test.txt")) {
diff --git a/test/join_test.c b/test/join_test.c
index 66604f5..c380dba 100644
--- a/test/join_test.c
+++ b/test/join_test.c
@@ -4,7 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int join_multiple()
+int join_multiple(void)
 {
   char buffer[FILENAME_MAX];
   const char *paths[3];
@@ -29,7 +29,7 @@ int join_multiple()
   return EXIT_SUCCESS;
 }
 
-int join_relative_back_after_root()
+int join_relative_back_after_root(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -49,7 +49,7 @@ int join_relative_back_after_root()
   return EXIT_SUCCESS;
 }
 
-int join_back_after_root()
+int join_back_after_root(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -69,7 +69,7 @@ int join_back_after_root()
   return EXIT_SUCCESS;
 }
 
-int join_with_two_roots()
+int join_with_two_roots(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -89,7 +89,7 @@ int join_with_two_roots()
   return EXIT_SUCCESS;
 }
 
-int join_two_unc()
+int join_two_unc(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -109,7 +109,7 @@ int join_two_unc()
   return EXIT_SUCCESS;
 }
 
-int join_two_absolute()
+int join_two_absolute(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -128,7 +128,7 @@ int join_two_absolute()
   return EXIT_SUCCESS;
 }
 
-int join_empty()
+int join_empty(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -147,7 +147,7 @@ int join_empty()
   return EXIT_SUCCESS;
 }
 
-int join_navigate_back()
+int join_navigate_back(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
@@ -166,7 +166,7 @@ int join_navigate_back()
   return EXIT_SUCCESS;
 }
 
-int join_simple()
+int join_simple(void)
 {
   char buffer[FILENAME_MAX];
   size_t length;
diff --git a/test/normalize_test.c b/test/normalize_test.c
index 4c7a99d..1d9afb5 100644
--- a/test/normalize_test.c
+++ b/test/normalize_test.c
@@ -6,7 +6,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int normalize_forward_slashes()
+int normalize_forward_slashes(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -25,7 +25,7 @@ int normalize_forward_slashes()
   return EXIT_SUCCESS;
 }
 
-int normalize_back_after_root()
+int normalize_back_after_root(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -44,7 +44,7 @@ int normalize_back_after_root()
   return EXIT_SUCCESS;
 }
 
-int normalize_only_separators()
+int normalize_only_separators(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -63,7 +63,7 @@ int normalize_only_separators()
   return EXIT_SUCCESS;
 }
 
-int normalize_empty()
+int normalize_empty(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -82,7 +82,7 @@ int normalize_empty()
   return EXIT_SUCCESS;
 }
 
-int normalize_overlap()
+int normalize_overlap(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -101,7 +101,7 @@ int normalize_overlap()
   return EXIT_SUCCESS;
 }
 
-int normalize_mixed()
+int normalize_mixed(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -119,7 +119,7 @@ int normalize_mixed()
   return EXIT_SUCCESS;
 }
 
-int normalize_remove_current()
+int normalize_remove_current(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -137,7 +137,7 @@ int normalize_remove_current()
   return EXIT_SUCCESS;
 }
 
-int normalize_double_separator()
+int normalize_double_separator(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -155,7 +155,7 @@ int normalize_double_separator()
   return EXIT_SUCCESS;
 }
 
-int normalize_terminated()
+int normalize_terminated(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -188,7 +188,7 @@ int normalize_terminated()
   return EXIT_SUCCESS;
 }
 
-int normalize_relative_too_far()
+int normalize_relative_too_far(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -206,7 +206,7 @@ int normalize_relative_too_far()
   return EXIT_SUCCESS;
 }
 
-int normalize_absolute_too_far()
+int normalize_absolute_too_far(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -224,7 +224,7 @@ int normalize_absolute_too_far()
   return EXIT_SUCCESS;
 }
 
-int normalize_navigate_back()
+int normalize_navigate_back(void)
 {
   size_t count;
   char result[FILENAME_MAX];
@@ -242,7 +242,7 @@ int normalize_navigate_back()
   return EXIT_SUCCESS;
 }
 
-int normalize_do_nothing()
+int normalize_do_nothing(void)
 {
   size_t count;
   char result[FILENAME_MAX];
diff --git a/test/relative_test.c b/test/relative_test.c
index 18a047d..b93799c 100755
--- a/test/relative_test.c
+++ b/test/relative_test.c
@@ -6,7 +6,7 @@
 
 #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]))
 
-int relative_root_forward_slashes()
+int relative_root_forward_slashes(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -26,7 +26,7 @@ int relative_root_forward_slashes()
   return EXIT_SUCCESS;
 }
 
-int relative_root_path_windows()
+int relative_root_path_windows(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -46,7 +46,7 @@ int relative_root_path_windows()
   return EXIT_SUCCESS;
 }
 
-int relative_root_path_unix()
+int relative_root_path_unix(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -66,7 +66,7 @@ int relative_root_path_unix()
   return EXIT_SUCCESS;
 }
 
-int relative_check()
+int relative_check(void)
 {
   const char *relative_paths[] = {"..", "test", "test/test", "../another_test",
     "./simple", ".././simple"};
@@ -91,7 +91,7 @@ int relative_check()
   return EXIT_SUCCESS;
 }
 
-int relative_relative_and_absolute()
+int relative_relative_and_absolute(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -113,7 +113,7 @@ int relative_relative_and_absolute()
   return EXIT_SUCCESS;
 }
 
-int relative_different_roots()
+int relative_different_roots(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -136,7 +136,7 @@ int relative_different_roots()
   return EXIT_SUCCESS;
 }
 
-int relative_skip_all()
+int relative_skip_all(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -155,7 +155,7 @@ int relative_skip_all()
   return EXIT_SUCCESS;
 }
 
-int relative_target_div_skipped_end()
+int relative_target_div_skipped_end(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -175,7 +175,7 @@ int relative_target_div_skipped_end()
   return EXIT_SUCCESS;
 }
 
-int relative_base_div_skipped_end()
+int relative_base_div_skipped_end(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -195,7 +195,7 @@ int relative_base_div_skipped_end()
   return EXIT_SUCCESS;
 }
 
-int relative_target_skipped_end()
+int relative_target_skipped_end(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -215,7 +215,7 @@ int relative_target_skipped_end()
   return EXIT_SUCCESS;
 }
 
-int relative_base_skipped_end()
+int relative_base_skipped_end(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -235,7 +235,7 @@ int relative_base_skipped_end()
   return EXIT_SUCCESS;
 }
 
-int relative_equal()
+int relative_equal(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -255,7 +255,7 @@ int relative_equal()
   return EXIT_SUCCESS;
 }
 
-int relative_same_base()
+int relative_same_base(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -275,7 +275,7 @@ int relative_same_base()
   return EXIT_SUCCESS;
 }
 
-int relative_long_target()
+int relative_long_target(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -295,7 +295,7 @@ int relative_long_target()
   return EXIT_SUCCESS;
 }
 
-int relative_long_base()
+int relative_long_base(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -315,7 +315,7 @@ int relative_long_base()
   return EXIT_SUCCESS;
 }
 
-int relative_relative()
+int relative_relative(void)
 {
   char result[FILENAME_MAX];
   size_t length;
@@ -335,7 +335,7 @@ int relative_relative()
   return EXIT_SUCCESS;
 }
 
-int relative_simple()
+int relative_simple(void)
 {
   char result[FILENAME_MAX];
   size_t length;
diff --git a/test/root_test.c b/test/root_test.c
index f6f2415..585091b 100755
--- a/test/root_test.c
+++ b/test/root_test.c
@@ -4,7 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int root_change_without_root()
+int root_change_without_root(void)
 {
   size_t length;
   char buffer[FILENAME_MAX] = "hello\\world.txt";
@@ -24,7 +24,7 @@ int root_change_without_root()
   return EXIT_SUCCESS;
 }
 
-int root_change_overlapping()
+int root_change_overlapping(void)
 {
   size_t length;
   char buffer[FILENAME_MAX] = "C:\\hello\\world.txt";
@@ -44,7 +44,7 @@ int root_change_overlapping()
   return EXIT_SUCCESS;
 }
 
-int root_change_separators()
+int root_change_separators(void)
 {
   size_t length;
   char buffer[FILENAME_MAX];
@@ -64,7 +64,7 @@ int root_change_separators()
   return EXIT_SUCCESS;
 }
 
-int root_change_empty()
+int root_change_empty(void)
 {
   size_t length;
   char buffer[FILENAME_MAX];
@@ -84,7 +84,7 @@ int root_change_empty()
   return EXIT_SUCCESS;
 }
 
-int root_change_simple()
+int root_change_simple(void)
 {
   size_t length;
   char buffer[FILENAME_MAX];
@@ -104,7 +104,7 @@ int root_change_simple()
   return EXIT_SUCCESS;
 }
 
-int root_relative_windows()
+int root_relative_windows(void)
 {
   size_t length;
 
@@ -118,7 +118,7 @@ int root_relative_windows()
   return EXIT_SUCCESS;
 }
 
-int root_relative_drive()
+int root_relative_drive(void)
 {
   size_t length;
 
@@ -132,7 +132,7 @@ int root_relative_drive()
   return EXIT_SUCCESS;
 }
 
-int root_device_question_mark()
+int root_device_question_mark(void)
 {
   size_t length;
 
@@ -146,7 +146,7 @@ int root_device_question_mark()
   return EXIT_SUCCESS;
 }
 
-int root_device_dot()
+int root_device_dot(void)
 {
   size_t length;
 
@@ -160,7 +160,7 @@ int root_device_dot()
   return EXIT_SUCCESS;
 }
 
-int root_device_unc()
+int root_device_unc(void)
 {
   size_t length;
 
@@ -174,7 +174,7 @@ int root_device_unc()
   return EXIT_SUCCESS;
 }
 
-int root_unc()
+int root_unc(void)
 {
   size_t length;
 
@@ -188,7 +188,7 @@ int root_unc()
   return EXIT_SUCCESS;
 }
 
-int root_absolute_drive()
+int root_absolute_drive(void)
 {
   size_t length;
 
@@ -202,7 +202,7 @@ int root_absolute_drive()
   return EXIT_SUCCESS;
 }
 
-int root_unix_drive()
+int root_unix_drive(void)
 {
   size_t length;
 
@@ -216,7 +216,7 @@ int root_unix_drive()
   return EXIT_SUCCESS;
 }
 
-int root_unix_backslash()
+int root_unix_backslash(void)
 {
   size_t length;
 
@@ -230,7 +230,7 @@ int root_unix_backslash()
   return EXIT_SUCCESS;
 }
 
-int root_windows_slash()
+int root_windows_slash(void)
 {
   size_t length;
 
@@ -244,7 +244,7 @@ int root_windows_slash()
   return EXIT_SUCCESS;
 }
 
-int root_windows_backslash()
+int root_windows_backslash(void)
 {
   size_t length;
 
@@ -258,7 +258,7 @@ int root_windows_backslash()
   return EXIT_SUCCESS;
 }
 
-int root_relative()
+int root_relative(void)
 {
   size_t length;
 
@@ -272,7 +272,7 @@ int root_relative()
   return EXIT_SUCCESS;
 }
 
-int root_absolute()
+int root_absolute(void)
 {
   size_t length;
 
diff --git a/test/segment_test.c b/test/segment_test.c
index 2b124b1..9f564c8 100644
--- a/test/segment_test.c
+++ b/test/segment_test.c
@@ -4,7 +4,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int segment_change_overlap()
+int segment_change_overlap(void)
 {
   char buffer[FILENAME_MAX] = "C:\\this\\cool\\path\\";
   struct cwk_segment segment;
@@ -28,7 +28,7 @@ int segment_change_overlap()
   return EXIT_SUCCESS;
 }
 
-int segment_change_with_separator()
+int segment_change_with_separator(void)
 {
   const char *path;
   char buffer[FILENAME_MAX];
@@ -54,7 +54,7 @@ int segment_change_with_separator()
   return EXIT_SUCCESS;
 }
 
-int segment_change_empty()
+int segment_change_empty(void)
 {
   const char *path;
   char buffer[FILENAME_MAX];
@@ -80,7 +80,7 @@ int segment_change_empty()
   return EXIT_SUCCESS;
 }
 
-int segment_change_trim()
+int segment_change_trim(void)
 {
   const char *path;
   char buffer[FILENAME_MAX];
@@ -106,7 +106,7 @@ int segment_change_trim()
   return EXIT_SUCCESS;
 }
 
-int segment_change_last()
+int segment_change_last(void)
 {
   const char *path;
   char buffer[FILENAME_MAX];
@@ -139,7 +139,7 @@ int segment_change_last()
   return EXIT_SUCCESS;
 }
 
-int segment_change_first()
+int segment_change_first(void)
 {
   const char *path;
   char buffer[FILENAME_MAX];
@@ -172,7 +172,7 @@ int segment_change_first()
   return EXIT_SUCCESS;
 }
 
-int segment_change_simple()
+int segment_change_simple(void)
 {
   const char *path;
   char buffer[FILENAME_MAX];
@@ -198,7 +198,7 @@ int segment_change_simple()
   return EXIT_SUCCESS;
 }
 
-int segment_back_with_root()
+int segment_back_with_root(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -229,7 +229,7 @@ int segment_back_with_root()
   return EXIT_SUCCESS;
 }
 
-int segment_type()
+int segment_type(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -281,7 +281,7 @@ int segment_type()
   return EXIT_SUCCESS;
 }
 
-int segment_previous_too_far_root()
+int segment_previous_too_far_root(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -313,7 +313,7 @@ int segment_previous_too_far_root()
   return EXIT_SUCCESS;
 }
 
-int segment_previous_too_far()
+int segment_previous_too_far(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -345,7 +345,7 @@ int segment_previous_too_far()
   return EXIT_SUCCESS;
 }
 
-int segment_previous_relative()
+int segment_previous_relative(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -385,7 +385,7 @@ int segment_previous_relative()
   return EXIT_SUCCESS;
 }
 
-int segment_previous_absolute()
+int segment_previous_absolute(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -425,7 +425,7 @@ int segment_previous_absolute()
   return EXIT_SUCCESS;
 }
 
-int segment_previous_relative_one_char_first()
+int segment_previous_relative_one_char_first(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -497,7 +497,7 @@ int segment_previous_relative_one_char_first()
   return EXIT_SUCCESS;
 }
 
-int segment_previous_absolute_one_char_first()
+int segment_previous_absolute_one_char_first(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -569,7 +569,7 @@ int segment_previous_absolute_one_char_first()
   return EXIT_SUCCESS;
 }
 
-int segment_next_too_far()
+int segment_next_too_far(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -597,7 +597,7 @@ int segment_next_too_far()
   return EXIT_SUCCESS;
 }
 
-int segment_next()
+int segment_next(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -629,7 +629,7 @@ int segment_next()
   return EXIT_SUCCESS;
 }
 
-int segment_last()
+int segment_last(void)
 {
   const char *path;
   struct cwk_segment segment;
@@ -659,7 +659,7 @@ int segment_last()
   return EXIT_SUCCESS;
 }
 
-int segment_first()
+int segment_first(void)
 {
   const char *path;
   struct cwk_segment segment;
diff --git a/test/windows_test.c b/test/windows_test.c
index ae75771..b674268 100755
--- a/test/windows_test.c
+++ b/test/windows_test.c
@@ -3,7 +3,7 @@
 #include <stdlib.h>
 #include <string.h>
 
-int windows_root_empty()
+int windows_root_empty(void)
 {
   size_t size;
   cwk_path_set_style(CWK_STYLE_WINDOWS);
@@ -16,7 +16,7 @@ int windows_root_empty()
   return EXIT_SUCCESS;
 }
 
-int windows_root_backslash()
+int windows_root_backslash(void)
 {
   size_t size;
   cwk_path_set_style(CWK_STYLE_WINDOWS);
@@ -29,7 +29,7 @@ int windows_root_backslash()
   return EXIT_SUCCESS;
 }
 
-int windows_intersection_case()
+int windows_intersection_case(void)
 {
   cwk_path_set_style(CWK_STYLE_WINDOWS);
 
@@ -41,7 +41,7 @@ int windows_intersection_case()
   return EXIT_SUCCESS;
 }
 
-int windows_get_root_relative()
+int windows_get_root_relative(void)
 {
   size_t size;
   cwk_path_set_style(CWK_STYLE_WINDOWS);
@@ -54,7 +54,7 @@ int windows_get_root_relative()
   return EXIT_SUCCESS;
 }
 
-int windows_get_root_separator()
+int windows_get_root_separator(void)
 {
   size_t size;
   cwk_path_set_style(CWK_STYLE_WINDOWS);
@@ -67,7 +67,7 @@ int windows_get_root_separator()
   return EXIT_SUCCESS;
 }
 
-int windows_get_unc_root()
+int windows_get_unc_root(void)
 {
   size_t size;
 
@@ -81,7 +81,7 @@ int windows_get_unc_root()
   return EXIT_SUCCESS;
 }
 
-int windows_get_root()
+int windows_get_root(void)
 {
   size_t size;
 
@@ -95,7 +95,7 @@ int windows_get_root()
   return EXIT_SUCCESS;
 }
 
-int windows_change_style()
+int windows_change_style(void)
 {
   enum cwk_path_style style;