diff --git a/reactos/include/reactos/win32k/ntgdityp.h b/reactos/include/reactos/win32k/ntgdityp.h
index 93ba5903ff0..07c10643b28 100644
--- a/reactos/include/reactos/win32k/ntgdityp.h
+++ b/reactos/include/reactos/win32k/ntgdityp.h
@@ -45,6 +45,7 @@ typedef enum _GETDCDWORD
 {
     GdiGetRelAbs = 1,
     GdiGetArcDirection = 4,
+    GdiGetIsMemDc = 7,
 } GETDCDWORD, *PGETDCDWORD;
 
 typedef enum _GETSETDCDWORD