diff --git a/app/assets/javascripts/discourse/components/topic-list.js.es6 b/app/assets/javascripts/discourse/components/topic-list.js.es6
index 0f080e83afd..522efc43468 100644
--- a/app/assets/javascripts/discourse/components/topic-list.js.es6
+++ b/app/assets/javascripts/discourse/components/topic-list.js.es6
@@ -32,7 +32,7 @@ export default Ember.Component.extend({
     return this.get('order') === "op_likes";
   }.property('order'),
 
-  @observes('topics.@each')
+  @observes('topics.[]')
   topicsAdded() {
     // special case so we don't keep scanning huge lists
     if (!this.get('lastVisitedTopic')) {