diff --git a/effects/scale/package/contents/code/main.js b/effects/scale/package/contents/code/main.js
index 11b58c78a5..3ebcd74b14 100644
--- a/effects/scale/package/contents/code/main.js
+++ b/effects/scale/package/contents/code/main.js
@@ -62,7 +62,7 @@ var scaleEffect = {
         }
 
         // Don't animate combobox popups, tooltips, popup menus, etc.
-        if (window.popup) {
+        if (window.popupWindow) {
             return false;
         }