diff --git a/src/Forum/Content/Discussion.php b/src/Forum/Content/Discussion.php
index 0000a6027..0ba508700 100644
--- a/src/Forum/Content/Discussion.php
+++ b/src/Forum/Content/Discussion.php
@@ -90,6 +90,7 @@ class Discussion implements ContentInterface
         }
 
         $document->title = $apiDocument->data->attributes->title;
+        $document->canonicalUrl = $url([]);
         $document->content = $this->view->make('flarum.forum::frontend.content.discussion', compact('apiDocument', 'page', 'getResource', 'posts', 'url'));
         $document->payload['apiDocument'] = $apiDocument;