diff --git a/addons/sms/models/sms_sms.py b/addons/sms/models/sms_sms.py
index 4de8186d810..a1c197a6cb1 100644
--- a/addons/sms/models/sms_sms.py
+++ b/addons/sms/models/sms_sms.py
@@ -42,7 +42,7 @@ class SmsSms(models.Model):
         # mass mode specific codes
         ('sms_blacklist', 'Blacklisted'),
         ('sms_duplicate', 'Duplicate'),
-    ])
+    ], copy=False)
 
     def send(self, delete_all=False, auto_commit=False, raise_exception=False):
         """ Main API method to send SMS.