diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index 077b66ec6..cc9b279f9 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -5,7 +5,7 @@ require_dependency 'distributed_memoizer'
 class PostsController < ApplicationController
 
   # Need to be logged in for all actions here
-  before_filter :ensure_logged_in, except: [:show, :replies, :by_number, :short_link, :reply_history, :revisions, :expand_embed]
+  before_filter :ensure_logged_in, except: [:show, :replies, :by_number, :short_link, :reply_history, :revisions, :expand_embed, :markdown]
 
   skip_before_filter :store_incoming_links, only: [:short_link]
   skip_before_filter :check_xhr, only: [:markdown,:short_link]