diff --git a/browser/components/safebrowsing/content/sb-loader.js b/browser/components/safebrowsing/content/sb-loader.js
index 11a49444f91..f1152c87abb 100644
--- a/browser/components/safebrowsing/content/sb-loader.js
+++ b/browser/components/safebrowsing/content/sb-loader.js
@@ -35,8 +35,6 @@
 # ***** END LICENSE BLOCK *****
 
 var safebrowsing = {
-  appContext: null,
-
   startup: function() {
     setTimeout(function() {
       safebrowsing.deferredStartup();