diff --git a/addons/mail/models/mail_thread.py b/addons/mail/models/mail_thread.py
index feea6292e8f..7f30862be5f 100644
--- a/addons/mail/models/mail_thread.py
+++ b/addons/mail/models/mail_thread.py
@@ -1691,7 +1691,7 @@ class MailThread(models.AbstractModel):
             partner_to_subscribe = partner_ids
             if self._context.get('mail_post_autofollow_partner_ids'):
                 partner_to_subscribe = filter(lambda item: item in self._context.get('mail_post_autofollow_partner_ids'), partner_ids)
-            self.message_subscribe(list(partner_to_subscribe))
+            self.message_subscribe(list(partner_to_subscribe), force=False)
 
         # _mail_flat_thread: automatically set free messages to the first posted message
         MailMessage = self.env['mail.message']
@@ -1743,7 +1743,7 @@ class MailThread(models.AbstractModel):
                 # done with SUPERUSER_ID, because on some models users can post only with read access, not necessarily write access
                 self.sudo().write({'message_last_post': fields.Datetime.now()})
         if new_message.author_id and model and self.ids and message_type != 'notification' and not self._context.get('mail_create_nosubscribe'):
-            self.message_subscribe([new_message.author_id.id])
+            self.message_subscribe([new_message.author_id.id], force=False)
         return new_message
 
     @api.multi