diff --git a/libs/main/thread/piconditionvar.cpp b/libs/main/thread/piconditionvar.cpp
index a1092e13..7eb476d9 100644
--- a/libs/main/thread/piconditionvar.cpp
+++ b/libs/main/thread/piconditionvar.cpp
@@ -46,10 +46,12 @@ PIConditionVariable::PIConditionVariable() {
 #else
 	PRIVATE->isDestroying = false;
 
-    pthread_condattr_t condattr;
-    pthread_condattr_init(&condattr);
-    pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
-    memset(&(PRIVATE->nativeHandle), 0, sizeof(PRIVATE->nativeHandle));
+	pthread_condattr_t condattr;
+	pthread_condattr_init(&condattr);
+#  ifndef MAC_OS
+	pthread_condattr_setclock(&condattr, CLOCK_MONOTONIC);
+#  endif
+	memset(&(PRIVATE->nativeHandle), 0, sizeof(PRIVATE->nativeHandle));
 	pthread_cond_init(&PRIVATE->nativeHandle, &condattr);
 #endif
 }