diff --git a/addons/auth_signup/models/res_users.py b/addons/auth_signup/models/res_users.py
index 72860e96ba5..2031b1f51ee 100644
--- a/addons/auth_signup/models/res_users.py
+++ b/addons/auth_signup/models/res_users.py
@@ -187,6 +187,7 @@ class ResUsers(models.Model):
         email_values = {
             'email_cc': False,
             'auto_delete': True,
+            'message_type': 'user_notification',
             'recipient_ids': [],
             'partner_ids': [],
             'scheduled_date': False,