diff --git a/addons/mail/tests/discuss/test_message_controller.py b/addons/mail/tests/discuss/test_message_controller.py
index 46e1cc5784f..4ac58655f93 100644
--- a/addons/mail/tests/discuss/test_message_controller.py
+++ b/addons/mail/tests/discuss/test_message_controller.py
@@ -178,7 +178,7 @@ class TestMessageController(HttpCase):
         demo = self.authenticate("demo", "demo")
         channel = self.env["discuss.channel"].create({"group_public_id": None, "name": "public_channel"})
         channel.add_members(
-            self.env["res.users"].browse(demo.uid).partner_id.id
+            self.env["res.users"].browse(demo.uid).partner_id.ids
         )  # don't care, we just need a channel where demo is follower
         no_access_request = self.url_open("/web/content/" + str(att.id))
         self.assertFalse(