diff --git a/addons/mail/tests/test_mail_gateway.py b/addons/mail/tests/test_mail_gateway.py
index 445244ff75a..27c79c801e2 100644
--- a/addons/mail/tests/test_mail_gateway.py
+++ b/addons/mail/tests/test_mail_gateway.py
@@ -147,7 +147,6 @@ class TestMailgateway(TestMailBase):
         self.assertEqual(mail.reply_to, 'other@example.com',
                         'mail_mail: reply_to should be equal to the one coming from creation values')
         # Do: create a mail_mail with the previous mail_message
-        self.mail_message.write(cr, uid, [msg_id], {'reply_to': 'other@example.com'})
         msg.refresh()
         mail_id = self.mail_mail.create(cr, uid, {'mail_message_id': msg_id, 'state': 'cancel'})
         mail = self.mail_mail.browse(cr, uid, mail_id)