diff --git a/frappe/contacts/doctype/address/address.py b/frappe/contacts/doctype/address/address.py
index 448be8f960..f2d4eef8a5 100644
--- a/frappe/contacts/doctype/address/address.py
+++ b/frappe/contacts/doctype/address/address.py
@@ -14,6 +14,7 @@ from frappe.utils.user import is_website_user
 from frappe.model.naming import make_autoname
 from frappe.core.doctype.dynamic_link.dynamic_link import deduplicate_dynamic_links
 from six import iteritems, string_types
+from past.builtins import cmp
 
 import functools
 
diff --git a/requirements.txt b/requirements.txt
index d62240db17..0949f7a5e0 100644
--- a/requirements.txt
+++ b/requirements.txt
@@ -48,3 +48,4 @@ googlemaps
 mycli
 dill
 braintree
+future
\ No newline at end of file