diff --git a/addons/mail/models/res_partner.py b/addons/mail/models/res_partner.py
index a44920a5b92..379895ac9af 100644
--- a/addons/mail/models/res_partner.py
+++ b/addons/mail/models/res_partner.py
@@ -27,7 +27,7 @@ class Partner(models.Model):
     opt_out = fields.Boolean(
         'Opt-Out', help="If opt-out is checked, this contact has refused to receive emails for mass mailing and marketing campaign. "
                         "Filter 'Available for Mass Mailing' allows users to filter the partners when performing mass mailing.")
-    channel_ids = fields.Many2many('mail.channel', 'mail_channel_partner', 'partner_id', 'channel_id', string='Channels')
+    channel_ids = fields.Many2many('mail.channel', 'mail_channel_partner', 'partner_id', 'channel_id', string='Channels', copy=False)
 
     @api.multi
     def message_get_suggested_recipients(self):