diff --git a/puppet/zulip_ops/manifests/postgres_master.pp b/puppet/zulip_ops/manifests/postgres_master.pp
index a1e5364c67..ac4fcbe89a 100644
--- a/puppet/zulip_ops/manifests/postgres_master.pp
+++ b/puppet/zulip_ops/manifests/postgres_master.pp
@@ -33,7 +33,7 @@ class zulip_ops::postgres_master {
   # This one will probably fail most of the time
   exec {'give_nagios_user_access':
     # lint:ignore:140chars
-    command => "su postgres -c -- bash -c 'psql -v ON_ERROR_STOP=1 zulip < /usr/share/postgresql/${zulip::base::postgres_version}/zulip_nagios_setup.sql' && touch /usr/share/postgresql/${zulip::base::postgres_version}/zulip_nagios_setup.sql.applied",
+    command => "bash -c \"su postgres -c 'psql -v ON_ERROR_STOP=1 zulip < /usr/share/postgresql/${zulip::base::postgres_version}/zulip_nagios_setup.sql' && touch /usr/share/postgresql/${zulip::base::postgres_version}/zulip_nagios_setup.sql.applied\"",
     # lint:endignore
     creates => "/usr/share/postgresql/${zulip::base::postgres_version}/zulip_nagios_setup.sql.applied",
     require => Package["postgresql-${zulip::base::postgres_version}"],