diff --git a/Common/Src/RWLock.h b/Common/Src/RWLock.h
index b7b1e2ce0..59f475e5e 100644
--- a/Common/Src/RWLock.h
+++ b/Common/Src/RWLock.h
@@ -25,6 +25,7 @@
 #pragma once
 
 #include "CriticalSection.h"
+#include "Semaphore.h"
 
 class CSWMR
 {