diff --git a/Source/Core/Common/Src/CommonTypes.h b/Source/Core/Common/Src/CommonTypes.h
index ba82d43439..3eb131c1a1 100644
--- a/Source/Core/Common/Src/CommonTypes.h
+++ b/Source/Core/Common/Src/CommonTypes.h
@@ -11,6 +11,7 @@
 #define _COMMONTYPES_H_
 
 #include <cstdint>
+#include <cstddef>
 
 #ifdef _WIN32