diff --git a/include/private/vkd3d_test.h b/include/private/vkd3d_test.h
index e0224143..fd5e331a 100644
--- a/include/private/vkd3d_test.h
+++ b/include/private/vkd3d_test.h
@@ -25,6 +25,7 @@
 
 #include <inttypes.h>
 #include <stdarg.h>
+#include <stdbool.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -91,7 +92,7 @@ static struct
 } vkd3d_test_state;
 
 static void VKD3D_PRINTF_FUNC(3, 4) VKD3D_UNUSED
-vkd3d_test_ok(unsigned int line, int result, const char *fmt, ...)
+vkd3d_test_ok(unsigned int line, bool result, const char *fmt, ...)
 {
     if (result)
     {
@@ -111,7 +112,7 @@ vkd3d_test_ok(unsigned int line, int result, const char *fmt, ...)
 }
 
 static void VKD3D_PRINTF_FUNC(3, 4) VKD3D_UNUSED
-vkd3d_test_todo(unsigned int line, int result, const char *fmt, ...)
+vkd3d_test_todo(unsigned int line, bool result, const char *fmt, ...)
 {
     va_list args;
 
@@ -180,4 +181,4 @@ int main(void)
     return vkd3d_test_state.failure_count || vkd3d_test_state.todo_success_count;
 }
 
-#endif  /* __VKD3D_TEST__H */
+#endif  /* __VKD3D_TEST_H */
diff --git a/tests/d3d12.c b/tests/d3d12.c
index 8cd0d84a..94fc87fb 100644
--- a/tests/d3d12.c
+++ b/tests/d3d12.c
@@ -68,7 +68,7 @@ static ULONG get_refcount_(IUnknown *iface)
 }
 
 #define check_interface(a, b, c) check_interface_(__LINE__, (IUnknown *)a, b, c)
-static void check_interface_(unsigned int line, IUnknown *iface, REFIID riid, BOOL supported)
+static void check_interface_(unsigned int line, IUnknown *iface, REFIID riid, bool supported)
 {
     HRESULT hr, expected_hr;
     IUnknown *unk;
@@ -223,7 +223,7 @@ static HANDLE create_thread(thread_main_pfn main_pfn, void *user_data)
     return CreateThread(NULL, 0, test_thread_main, data, 0, NULL);
 }
 
-static BOOL join_thread(HANDLE thread)
+static bool join_thread(HANDLE thread)
 {
     int ret;
 
@@ -266,7 +266,7 @@ static HANDLE create_thread(thread_main_pfn main_pfn, void *user_data)
     return thread;
 }
 
-static BOOL join_thread(HANDLE untyped_thread)
+static bool join_thread(HANDLE untyped_thread)
 {
     pthread_t *thread = untyped_thread;
     int rc;