diff --git a/addons/mail/mail_message.py b/addons/mail/mail_message.py
index 95c34ad5c51..1f588fc7663 100644
--- a/addons/mail/mail_message.py
+++ b/addons/mail/mail_message.py
@@ -63,7 +63,7 @@ class mail_message(osv.Model):
         # protection for `default_type` values leaking from menu action context (e.g. for invoices)
         if context and context.get('default_type') and context.get('default_type') not in self._columns['type'].selection:
             context = dict(context, default_type=None)
-        return super(mail_message, self).default_get(cr, uid, fields, context=context) 
+        return super(mail_message, self).default_get(cr, uid, fields, context=context)
 
     def _shorten_name(self, name):
         if len(name) <= (self._message_record_name_length + 3):
diff --git a/addons/mail/mail_thread.py b/addons/mail/mail_thread.py
index d308105d81e..2d73bb16ea6 100644
--- a/addons/mail/mail_thread.py
+++ b/addons/mail/mail_thread.py
@@ -122,7 +122,7 @@ class mail_thread(osv.AbstractModel):
         return res
 
     def _search_unread(self, cr, uid, obj=None, name=None, domain=None, context=None):
-        return ['&', ('message_ids.model', '=', self._name), ('message_ids.notification_ids.to_read', '=', False)]
+        return [('message_ids.to_read', '=', False)]
 
     def _get_followers(self, cr, uid, ids, name, arg, context=None):
         fol_obj = self.pool.get('mail.followers')