diff --git a/app/controllers/forum_topics_controller.rb b/app/controllers/forum_topics_controller.rb
index f0e7956eb..fc8e97830 100644
--- a/app/controllers/forum_topics_controller.rb
+++ b/app/controllers/forum_topics_controller.rb
@@ -28,7 +28,9 @@ class ForumTopicsController < ApplicationController
 
   def show
     @forum_topic = ForumTopic.find(params[:id])
-    @forum_topic.mark_as_read!(CurrentUser.user)
+    unless CurrentUser.user.is_anonymous?
+      @forum_topic.mark_as_read!(CurrentUser.user)
+    end
     @forum_posts = ForumPost.search(:topic_id => @forum_topic.id).order("forum_posts.id").paginate(params[:page])
     @forum_posts.each # hack to force rails to eager load
     respond_with(@forum_topic)