diff --git a/puppet/zulip_ops/files/zulip-ec2-configure-interfaces b/puppet/zulip_ops/files/zulip-ec2-configure-interfaces
index f63f3566ed..8d8dfcf6ea 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 python
+#!/usr/bin/env python2.7
 # -*- coding: utf-8 -*-
 #
 # Copyright © 2013 Zulip, Inc.
diff --git a/puppet/zulip_ops/manifests/base.pp b/puppet/zulip_ops/manifests/base.pp
index e5ad02cbba..729fa3573a 100644
--- a/puppet/zulip_ops/manifests/base.pp
+++ b/puppet/zulip_ops/manifests/base.pp
@@ -19,9 +19,8 @@ class zulip_ops::base {
                         # Needed for zulip-ec2-configure-network-interfaces
                         "python3-six",
                         "python-six",
-                          # This one is needed for postgres as well
                         # "python3-boto", # missing on trusty
-                        "python-boto",
+                        "python-boto", # needed for postgres_common too
                         "python3-netifaces",
                         "python-netifaces",
                         # Popular editors