diff --git a/browser/metro/base/content/browser-scripts.js b/browser/metro/base/content/browser-scripts.js
index d0a64f8854c..c4c03934b4f 100644
--- a/browser/metro/base/content/browser-scripts.js
+++ b/browser/metro/base/content/browser-scripts.js
@@ -37,9 +37,8 @@ XPCOMUtils.defineLazyModuleGetter(this, "Task",
 XPCOMUtils.defineLazyModuleGetter(this, "CrossSlide",
                                   "resource:///modules/CrossSlide.jsm");
 
-XPCOMUtils.defineLazyGetter(this, "OS",
+XPCOMUtils.defineLazyModuleGetter(this, "OS",
                                   "resource://gre/modules/osfile.jsm");
-
 XPCOMUtils.defineLazyModuleGetter(this, "View",
                                   "resource:///modules/View.jsm");