diff --git a/win32ss/user/ntuser/display.c b/win32ss/user/ntuser/display.c
index 5295573437e..3c39c05ec35 100644
--- a/win32ss/user/ntuser/display.c
+++ b/win32ss/user/ntuser/display.c
@@ -621,7 +621,7 @@ NtUserEnumDisplaySettings(
     }
     _SEH2_END;
 
-    if (lpDevMode->dmSize != sizeof(DEVMODEW))
+    if (cbSize != sizeof(DEVMODEW))
     {
         return STATUS_BUFFER_TOO_SMALL;
     }