diff --git a/cpp/src/cache/CpuCacheMgr.h b/cpp/src/cache/CpuCacheMgr.h
index 7f37f90789..0d4fdbb8ac 100644
--- a/cpp/src/cache/CpuCacheMgr.h
+++ b/cpp/src/cache/CpuCacheMgr.h
@@ -3,6 +3,7 @@
 // Unauthorized copying of this file, via any medium is strictly prohibited.
 // Proprietary and confidential.
 ////////////////////////////////////////////////////////////////////////////////
+#pragma once
 
 #include "CacheMgr.h"