diff --git a/addons/mail/mail_alias.py b/addons/mail/mail_alias.py
index ef204d7a8cb..d9c49d833ab 100644
--- a/addons/mail/mail_alias.py
+++ b/addons/mail/mail_alias.py
@@ -66,7 +66,7 @@ class mail_alias(osv.Model):
         'alias_name': fields.char('Alias', required=True,
                             help="The name of the email alias, e.g. 'jobs' "
                                  "if you want to catch emails for <jobs@example.my.openerp.com>",),
-        'alias_model_id': fields.many2one('ir.model', 'Aliased Model', required=True,
+        'alias_model_id': fields.many2one('ir.model', 'Aliased Model', required=True, ondelete="cascade",
                                           help="The model (OpenERP Document Kind) to which this alias "
                                                "corresponds. Any incoming email that does not reply to an "
                                                "existing record will cause the creation of a new record "