diff --git a/tripleoclient/v1/overcloud_deploy.py b/tripleoclient/v1/overcloud_deploy.py
index dca125189..75d005588 100644
--- a/tripleoclient/v1/overcloud_deploy.py
+++ b/tripleoclient/v1/overcloud_deploy.py
@@ -408,8 +408,7 @@ class DeployOvercloud(command.Command):
         no_proxy_list = map(utils.bracket_ipv6,
                             [no_proxy, overcloud_ip_or_fqdn,
                              keystone_admin_ip])
-        os.environ['no_proxy'] = ','.join(
-            [x for x in no_proxy_list if x is not None])
+        os.environ['no_proxy'] = ','.join([x for x in no_proxy_list if x])
 
         utils.remove_known_hosts(overcloud_ip_or_fqdn)