diff --git a/core/modules/widgets/draggable.js b/core/modules/widgets/draggable.js
index d1bdf2a16..e12f2c693 100644
--- a/core/modules/widgets/draggable.js
+++ b/core/modules/widgets/draggable.js
@@ -80,7 +80,7 @@ Selectively refreshes the widget if needed. Returns true if the widget or any of
 */
 DraggableWidget.prototype.refresh = function(changedTiddlers) {
 	var changedAttributes = this.computeAttributes();
-	if(changedTiddlers.tag || changedTiddlers["class"]) {
+	if(changedAttributes.tag || changedAttributes["class"]) {
 		this.refreshSelf();
 		return true;
 	}