diff --git a/js/inbox_controller.js b/js/inbox_controller.js
index e28682e1..86bbd6f5 100644
--- a/js/inbox_controller.js
+++ b/js/inbox_controller.js
@@ -25,7 +25,7 @@
 
     window.inbox = new Whisper.ConversationCollection([], {
         comparator: function(model) {
-            return -model.active_at;
+            return -model.get('active_at');
         }
     });