diff --git a/reactos/include/psdk/ntgdi.h b/reactos/include/psdk/ntgdi.h
index 1afc9671e6a..51f669cf857 100644
--- a/reactos/include/psdk/ntgdi.h
+++ b/reactos/include/psdk/ntgdi.h
@@ -2980,7 +2980,8 @@ APIENTRY
 NtGdiEngCreateDeviceBitmap(
     IN DHSURF dhsurf,
     IN SIZEL sizl,
-    IN ULONG iFormatCompat
+    IN ULONG iFormatCompat,
+    IN DWORD UNKNOWN
 );
 
 W32KAPI