diff --git a/app/serializers/post_wordpress_serializer.rb b/app/serializers/post_wordpress_serializer.rb
index c237d1cba..51c5613ea 100644
--- a/app/serializers/post_wordpress_serializer.rb
+++ b/app/serializers/post_wordpress_serializer.rb
@@ -1,5 +1,6 @@
 # The most basic attributes of a topic that we need to create a link for it.
 class PostWordpressSerializer < BasicPostSerializer
+  attributes :post_number
 
   include UrlHelper