diff --git a/source/js/jquery-sortable.js b/source/js/jquery-sortable.js
index 69a1312..33e1112 100644
--- a/source/js/jquery-sortable.js
+++ b/source/js/jquery-sortable.js
@@ -652,7 +652,7 @@
       return this._serialize(this.el, true)
     },
     refresh: function() {
-      this.traverse(function(object){
+      this.group.traverse(function(object){
         object._clearDimensions()
       })
     },