diff --git a/addons/website_sale/controllers/main.py b/addons/website_sale/controllers/main.py
index 5730fa3eb4e..bf3b8fe3a8b 100644
--- a/addons/website_sale/controllers/main.py
+++ b/addons/website_sale/controllers/main.py
@@ -1573,7 +1573,7 @@ class WebsiteSale(http.Controller):
             return request.redirect('/shop')
 
         if order and not order.amount_total and not tx_sudo:
-            order.with_context(send_email=True).action_confirm()
+            order.with_context(send_email=True).with_user(SUPERUSER_ID).action_confirm()
             return request.redirect(order.get_portal_url())
 
         # clean context and session, then redirect to the confirmation page