diff --git a/reactos/include/win32k/gdiobj.h b/reactos/include/win32k/gdiobj.h
index 99a879f5c77..dc98b016d47 100644
--- a/reactos/include/win32k/gdiobj.h
+++ b/reactos/include/win32k/gdiobj.h
@@ -7,6 +7,8 @@
 #ifndef __WIN32K_GDIOBJ_H
 #define __WIN32K_GDIOBJ_H
 
+#include <ddk/ntddk.h>
+
   /* GDI objects magic numbers */
 #define GO_PEN_MAGIC             0x4f47
 #define GO_BRUSH_MAGIC           0x4f48