diff --git a/extensions/window-list/windowPicker.js b/extensions/window-list/windowPicker.js
index 522313d6..59b2e902 100644
--- a/extensions/window-list/windowPicker.js
+++ b/extensions/window-list/windowPicker.js
@@ -83,8 +83,8 @@ class MyWorkspacesDisplay extends WorkspacesDisplay {
         this._workareasChangedId = 0;
 
         if (this._nWorkspacesChangedId)
-            global.workspace_manager.disconnect(this._nWorkspacesNotifyId);
-        this._nWorkspacesNotifyId = 0;
+            global.workspace_manager.disconnect(this._nWorkspacesChangedId);
+        this._nWorkspacesChangedId = 0;
 
         super._onDestroy();
     }