diff --git a/puppet/zulip_ops/files/zulip-ec2-configure-interfaces b/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
index ea88f57f1e..16fdcda8ff 100755
--- a/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
+++ b/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
@@ -1,4 +1,4 @@
-#!/usr/bin/env python2.7
+#!/usr/bin/env python3
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2013 Zulip, Inc.