diff --git a/app/helpers/categories_helper.rb b/app/helpers/categories_helper.rb
index bb87154d11feab1ad4da2fb89892b1fe8403085a..df1c9bc80d6cd95eb1f455d12261ab75ca1f113d 100644
--- a/app/helpers/categories_helper.rb
+++ b/app/helpers/categories_helper.rb
@@ -8,7 +8,8 @@ module CategoriesHelper
   def expandable?
     (defined?(@category) && !current_page?(new_category_path)) ||
       (defined?(@post) && !@post.category.nil?) ||
-      (defined?(@question) && !@question.category.nil?)
+      (defined?(@question) && !@question.category.nil?) ||
+      (defined?(@article) && !@article.category.nil?)
   end
 
   def current_category