diff --git a/odoo/addons/base/models/res_users.py b/odoo/addons/base/models/res_users.py
index b9f675e90ce..8210e58396b 100644
--- a/odoo/addons/base/models/res_users.py
+++ b/odoo/addons/base/models/res_users.py
@@ -828,8 +828,10 @@ class Users(models.Model):
     def has_group(self, group_ext_id):
         # use singleton's id if called on a non-empty recordset, otherwise
         # context uid
-        uid = self.id or self._uid
-        return self.with_user(uid)._has_group(group_ext_id)
+        uid = self.id
+        if uid and uid != self._uid:
+            self = self.with_user(uid)
+        return self._has_group(group_ext_id)
 
     @api.model
     @tools.ormcache('self._uid', 'group_ext_id')