diff --git a/frappe/model/utils/rename_field.py b/frappe/model/utils/rename_field.py
index b9fbe854b7..0fb2e29f34 100644
--- a/frappe/model/utils/rename_field.py
+++ b/frappe/model/utils/rename_field.py
@@ -1,3 +1,11 @@
+# Copyright (c) 2015, Frappe Technologies Pvt. Ltd. and Contributors
+# MIT License. See license.txt
+
+from __future__ import unicode_literals
+
+import frappe
+import json
+
 def rename_field(doctype, old_fieldname, new_fieldname):
 	"""This functions assumes that doctype is already synced"""