--- a/services/sync/tps/extensions/mozmill/resource/driver/controller.js
+++ b/services/sync/tps/extensions/mozmill/resource/driver/controller.js
@@ -23,17 +23,17 @@ var windows = {}; Cu.import('resource://
 var assert = new assertions.Assert();
 var waitFor = assert.waitFor;
 
 var sleep = utils.sleep;
 
 // For Mozmill 1.5 backward compatibility
 var windowMap = windows.map;
 
-waitForEvents = function () {
+var waitForEvents = function () {
 }
 
 waitForEvents.prototype = {
   /**
    * Initialize list of events for given node
    */
   init: function waitForEvents_init(node, events) {
     if (node.getNode != undefined)