1 files changed, 1 insertions, 1 deletions
diff --git a/common/content/marks.js b/common/content/marks.js
index a6eaa4be..d8c9736b 100644
--- a/common/content/marks.js
+++ b/common/content/marks.js
@@ -65,7 +65,7 @@ var Marks = Module("marks", {
         let mark = this.Mark();
 
         if (Marks.isURLMark(name)) {
-            mark.tab = Cu.getWeakReference(tabs.getTab());
+            mark.tab = util.weakReference(tabs.getTab());
             this._urlMarks.set(name, mark);
             var message = "mark.addURL";
         }