diff --git a/IPython/html/static/widgets/js/manager.js b/IPython/html/static/widgets/js/manager.js
index 69d3b635f..20d136598 100644
--- a/IPython/html/static/widgets/js/manager.js
+++ b/IPython/html/static/widgets/js/manager.js
@@ -36,6 +36,7 @@ define([
         }
 
         // Setup state saving code.
+        var that = this;
         this.notebook.events.on('notebook_saved.Notebook', function() {
             var save_callback = WidgetManager._save_callback;
             var options = WidgetManager._get_state_options;