diff --git a/Core/ThreadEventQueue.h b/Core/ThreadEventQueue.h
index c0732b6a8c..5d0b6d9d51 100644
--- a/Core/ThreadEventQueue.h
+++ b/Core/ThreadEventQueue.h
@@ -18,6 +18,7 @@
 #pragma once
 
 #include "native/base/mutex.h"
+#include "Core/System.h"
 #include "Core/CoreTiming.h"
 #include <deque>