diff --git a/test/unit_test.c b/test/unit_test.c
index 92c68ea..07551e9 100644
--- a/test/unit_test.c
+++ b/test/unit_test.c
@@ -179,6 +179,6 @@ int _utest_test_closure_failed = 0;
 int _utest_test_closure_passed = 0;
 
 char* _utest_current_test_unit_name = "";
-clock_t _utest_test_start, _utest_test_end;
+struct timespec _utest_test_start, _utest_test_end;
 
 int _utest_test_unit_return = 0;
diff --git a/test/unit_test.h b/test/unit_test.h
index 7a61cc9..11c93de 100644
--- a/test/unit_test.h
+++ b/test/unit_test.h
@@ -182,7 +182,7 @@ extern int _utest_test_closure_failed;
 extern int _utest_test_closure_passed;
 
 extern char* _utest_current_test_unit_name;
-extern clock_t _utest_test_start, _utest_test_end;
+extern struct timespec _utest_test_start, _utest_test_end;
 
 extern int _utest_test_unit_return;
 
@@ -191,15 +191,16 @@ extern int _utest_test_unit_return;
 	{                                                                                                                            \
 		printf( "Tarting %s unit tests\n", T );                                                                                  \
 		printf( "\n" );                                                                                                          \
-		_utest_test_start = clock();                                                                                             \
+		clock_gettime( CLOCK_MONOTONIC, &_utest_test_start );                                                                    \
 		BLOCK;                                                                                                                   \
-		_utest_test_end = clock();                                                                                               \
+		clock_gettime( CLOCK_MONOTONIC, &_utest_test_end );                                                                      \
 		printf( "\n" );                                                                                                          \
 		printf( "Test Suites: \033[31m%d failed\033[0m, \033[32m%d passed\033[0m, %d total\n", _utest_test_suite_failed,         \
 				_utest_test_suite_passed, _utest_test_suite_total );                                                             \
 		printf( "Test:        \033[31m%d failed\033[0m, \033[32m%d passed\033[0m, %d total\n", _utest_test_units_failed,         \
 				_utest_test_units_passed, _utest_test_units_total );                                                             \
-		printf( "Time:        %.4f s\n", (double)( _utest_test_end - _utest_test_start ) / CLK_TCK );                            \
+		printf( "Time:        %.4f s\n", (double)( ( _utest_test_end.tv_sec - _utest_test_start.tv_sec ) +                       \
+												   ( _utest_test_end.tv_nsec - _utest_test_start.tv_nsec ) / 1e9 ) );            \
 		printf( "\nRan all test suites.\n" );                                                                                    \
 		if ( _utest_test_units_failed == 0 )                                                                                     \
 		{                                                                                                                        \