diff --git a/addons/website_forum/controllers/main.py b/addons/website_forum/controllers/main.py
index e9d6b0a1fc2..a36733ebe24 100644
--- a/addons/website_forum/controllers/main.py
+++ b/addons/website_forum/controllers/main.py
@@ -105,7 +105,7 @@ class WebsiteForum(http.Controller):
 
         values = self._prepare_forum_values(forum=forum, searches=post)
         values.update({
-            'main_object': forum,
+            'main_object': tag or forum,
             'question_ids': question_ids,
             'pager': pager,
             'tag': tag,