@@ -28,25 +28,25 @@
 static of_rmutex_t globalMutex;
 
 static void
 init(void)
 {
-	if (!of_rmutex_new(&globalMutex))
+	if (of_rmutex_new(&globalMutex) != 0)
 		OBJC_ERROR("Failed to create global mutex!");
 }
 
 void
 objc_global_mutex_lock(void)
 {
 	static of_once_t once_control = OF_ONCE_INIT;
 	of_once(&once_control, init);
 
-	if (!of_rmutex_lock(&globalMutex))
+	if (of_rmutex_lock(&globalMutex) != 0)
 		OBJC_ERROR("Failed to lock global mutex!");
 }
 
 void
 objc_global_mutex_unlock(void)
 {
-	if (!of_rmutex_unlock(&globalMutex))
+	if (of_rmutex_unlock(&globalMutex) != 0)
 		OBJC_ERROR("Failed to unlock global mutex!");
 }