diff --git a/app/controllers/topics_controller.rb b/app/controllers/topics_controller.rb
index 8e4f1c12cd8..523813c108e 100644
--- a/app/controllers/topics_controller.rb
+++ b/app/controllers/topics_controller.rb
@@ -81,7 +81,7 @@ class TopicsController < ApplicationController
 
     perform_show_response
 
-    canonical_url absolute_without_cdn(@topic_view.canonical_path)
+    canonical_url absolute_without_cdn("#{Discourse.base_uri}#{@topic_view.canonical_path}")
   rescue Discourse::InvalidAccess => ex
 
     if current_user