diff --git a/app/views/topics/show.rss.erb b/app/views/topics/show.rss.erb
index 61be3b86ad..facdf9f01a 100644
--- a/app/views/topics/show.rss.erb
+++ b/app/views/topics/show.rss.erb
@@ -18,7 +18,7 @@
         <author><%= "#{site_email} (@#{post.user.username}#{" #{post.user.name}" if post.user.name.present?})" -%></author>
         <description><![CDATA[
           <% post_url = Discourse.base_url + post.url %>
-          <p><%= t('author_wrote', author: link_to(post.user.name, userpage_url(post.user))).html_safe %></p>
+          <p><%= t('author_wrote', author: link_to(post.user.name, userpage_url(post.user.username_lower))).html_safe %></p>
           <blockquote>
             <%= post.cooked.html_safe %>
           </blockquote>