diff --git a/reactos/include/psdk/ntgdi.h b/reactos/include/psdk/ntgdi.h
index 0d9359176db..4597308af45 100644
--- a/reactos/include/psdk/ntgdi.h
+++ b/reactos/include/psdk/ntgdi.h
@@ -2934,7 +2934,8 @@ NtGdiEngCreateBitmap(
     IN LONG lWidth,
     IN ULONG iFormat,
     IN FLONG fl,
-    IN OPTIONAL PVOID pvBits
+    IN OPTIONAL PVOID pvBits,
+    IN DWORD UNKNOWN
 );
 
 W32KAPI