diff --git a/addons/mail/static/tests/helpers/mock_server.js b/addons/mail/static/tests/helpers/mock_server.js
index cabc274fbbe0f5f3a44a3e007f794d020340dae9..7c6ccbd2ca8d5eda00108815982d1fddaeafb385 100644
--- a/addons/mail/static/tests/helpers/mock_server.js
+++ b/addons/mail/static/tests/helpers/mock_server.js
@@ -1215,7 +1215,7 @@ MockServer.include({
         this._widget.call('bus_service', 'trigger', 'notification', [{
             type: 'mail.channel/insert',
             payload: {
-                id: 20,
+                id,
                 avatarCacheKey: avatarCacheKey,
             },
         }]);