diff --git a/app/models/topic_list.rb b/app/models/topic_list.rb
index 52b0ee00708..d51c0f153f3 100644
--- a/app/models/topic_list.rb
+++ b/app/models/topic_list.rb
@@ -67,7 +67,7 @@ class TopicList
 
   def preload_key
     if @category
-      "topic_list_#{@category.url.sub(/^\//, '')}/l/#{@filter}"
+      "topic_list_#{@category.url.sub(/^\//, '')}/#{@category.id}/l/#{@filter}"
     else
       "topic_list_#{@filter}"
     end