diff --git a/addons/mail/mail_group.py b/addons/mail/mail_group.py
index 24aed942b1b..bb66c909ad6 100644
--- a/addons/mail/mail_group.py
+++ b/addons/mail/mail_group.py
@@ -111,7 +111,7 @@ class mail_group(osv.Model):
             partner_ids = []
             for group in mail_group.group_ids:
                 partner_ids += [user.partner_id.id for user in group.users]
-            self.message_subscribe(cr, uid, ids, partner_ids, context=context)
+            self.message_subscribe(cr, uid, ids, partner_ids, None, context=context)
 
     def create(self, cr, uid, vals, context=None):
         mail_alias = self.pool.get('mail.alias')
diff --git a/addons/mail/mail_thread.py b/addons/mail/mail_thread.py
index 528fd412e46..aff451a9935 100644
--- a/addons/mail/mail_thread.py
+++ b/addons/mail/mail_thread.py
@@ -1206,7 +1206,7 @@ class mail_thread(osv.AbstractModel):
 
             for pid, subtypes in new_followers.items():
                 subtypes = list(subtypes) if subtypes is not None else None
-                self.message_subscribe(cr, uid, [record.id], [pid], subtypes, context=context)
+                self.message_subscribe(cr, uid, [record.id], [pid], None, subtypes, context=context)
 
             # find first email message, set it as unread for auto_subscribe fields for them to have a notification
             if user_id_partner_ids: