diff --git a/app/views/list/list.rss.erb b/app/views/list/list.rss.erb
index b1eb41f10..7cc954ec2 100644
--- a/app/views/list/list.rss.erb
+++ b/app/views/list/list.rss.erb
@@ -30,7 +30,7 @@
           <discourse:topicPinned><%= topic.pinned_at ? 'Yes' : 'No' %></discourse:topicPinned>
           <discourse:topicClosed><%= topic.closed ? 'Yes' : 'No' %></discourse:topicClosed>
           <discourse:topicArchived><%= topic.archived ? 'Yes' : 'No' %></discourse:topicArchived>
-          <guid isPermaLink="false">topic-<%= topic.id %></guid>
+          <guid isPermaLink="false"><%= Discourse.current_hostname %>-topic-<%= topic.id %></guid>
           <source url="<%= topic_url %>.rss"><%= topic.title %></source>
         </item>
       <% end %>
diff --git a/app/views/posts/latest.rss.erb b/app/views/posts/latest.rss.erb
index 7cfb0a8e1..8f97eff3f 100644
--- a/app/views/posts/latest.rss.erb
+++ b/app/views/posts/latest.rss.erb
@@ -14,7 +14,7 @@
         <description><![CDATA[ <%= post.cooked.html_safe %> ]]></description>
         <link><%= Discourse.base_url + post.url %></link>
         <pubDate><%= post.created_at.rfc2822 %></pubDate>
-        <guid isPermaLink="false">post-<%= post.id %></guid>
+        <guid isPermaLink="false"><%= Discourse.current_hostname %>-post-<%= post.id %></guid>
       </item>
     <% end %>
   </channel>
diff --git a/app/views/topics/show.rss.erb b/app/views/topics/show.rss.erb
index e49890e2d..aa7d08c4a 100644
--- a/app/views/topics/show.rss.erb
+++ b/app/views/topics/show.rss.erb
@@ -30,7 +30,7 @@
         ]]></description>
         <link><%= post_url %></link>
         <pubDate><%= post.created_at.rfc2822 %></pubDate>
-        <guid isPermaLink="false">post-<%= post.topic_id %>-<%= post.post_number %></guid>
+        <guid isPermaLink="false"><%= Discourse.current_hostname %>-post-<%= post.topic_id %>-<%= post.post_number %></guid>
         <source url="<%= @topic_view.absolute_url %>.rss"><%= @topic_view.title %></source>
       </item>
     <% end %>