diff --git a/sdk/include/reactos/stubs.h b/sdk/include/reactos/stubs.h
index 21b85d492da..6b5cd36372c 100644
--- a/sdk/include/reactos/stubs.h
+++ b/sdk/include/reactos/stubs.h
@@ -1,4 +1,5 @@
 #define WIN32_NO_STATUS
+#define _NTSYSTEM_
 #include <windef.h>
 
 #ifndef PRIx64