diff --git a/app/assets/javascripts/discourse/views/topic.js.es6 b/app/assets/javascripts/discourse/views/topic.js.es6
index 186dc0f9e..a0520d58b 100644
--- a/app/assets/javascripts/discourse/views/topic.js.es6
+++ b/app/assets/javascripts/discourse/views/topic.js.es6
@@ -154,7 +154,7 @@ const TopicView = Ember.View.extend(AddCategoryClass, AddArchetypeClass, Scrolli
     } else {
       return I18n.t("topic.read_more", opts);
     }
-  }.property('topicTrackingState.messageCount')
+  }.property('topicTrackingState.messageCount', 'controller.content.category')
 });
 
 function highlight(postNumber) {