diff --git a/app/assets/javascripts/discourse/views/topic.js.es6 b/app/assets/javascripts/discourse/views/topic.js.es6
index bed33a452d..772291a513 100644
--- a/app/assets/javascripts/discourse/views/topic.js.es6
+++ b/app/assets/javascripts/discourse/views/topic.js.es6
@@ -15,7 +15,7 @@ var TopicView = Discourse.View.extend(AddCategoryClass, Discourse.Scrolling, {
   menuVisible: true,
   SHORT_POST: 1200,
 
-  categorySlug: Em.computed.alias('topic.category.slug'),
+  categoryFullSlug: Em.computed.alias('topic.category.fullSlug'),
 
   postStream: Em.computed.alias('controller.postStream'),