diff --git a/lib/main.js b/lib/main.js
index c0fedcf..dee469f 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -225,7 +225,7 @@ exports.main = function() {
     }
   });
 
-  windowUtils = new windowUtils.WindowTracker({
+  windowTracker = new windowUtils.WindowTracker({
     onTrack: function (window) {
       if ('chrome://mozapps/content/downloads/unknownContentType.xul' != window.location)
         return;