diff --git a/base/shell/explorer/traywnd.cpp b/base/shell/explorer/traywnd.cpp
index 9ca7b25781c..bf71ad0e172 100644
--- a/base/shell/explorer/traywnd.cpp
+++ b/base/shell/explorer/traywnd.cpp
@@ -2993,7 +2993,7 @@ public:
                        MF_BYCOMMAND);
         }
 
-        CheckMenuItem(hPopup,
+        CheckMenuItem(menubase,
                       ID_LOCKTASKBAR,
                       MF_BYCOMMAND | (g_TaskbarSettings.bLock ? MF_CHECKED : MF_UNCHECKED));