diff --git a/source/gameengine/Expressions/EXP_PyObjectPlus.h b/source/gameengine/Expressions/EXP_PyObjectPlus.h
index 32dc79cf6eb..504d79f7cbb 100644
--- a/source/gameengine/Expressions/EXP_PyObjectPlus.h
+++ b/source/gameengine/Expressions/EXP_PyObjectPlus.h
@@ -44,7 +44,8 @@
 #include "STR_String.h"
 #include "MT_Vector3.h"
 #include "SG_QList.h"
-#include <stddef.h>
+#include <cstddef>
+#include <cstdint>
 
 #ifdef WITH_PYTHON
 #ifdef USE_MATHUTILS