diff --git a/deployment/puppet/osnailyfacter/modular/roles/mongo_primary.pp b/deployment/puppet/osnailyfacter/modular/roles/mongo_primary.pp
index 44beebb8af..118da24bc6 100644
--- a/deployment/puppet/osnailyfacter/modular/roles/mongo_primary.pp
+++ b/deployment/puppet/osnailyfacter/modular/roles/mongo_primary.pp
@@ -8,13 +8,19 @@ $nodes_hash       = hiera('nodes')
 $roles            = node_roles($nodes_hash, hiera('uid'))
 
 ####################################################################
+if size(mongo_hosts($nodes_hash, 'array', 'mongo')) > 1 {
+  $replset = 'ceilometer'
+}
+else {
+  $replset = undef
+}
 
 class { 'openstack::mongo_primary':
   mongodb_bind_address        => [ '127.0.0.1', $internal_address ],
   ceilometer_metering_secret  => $ceilometer_hash['metering_secret'],
   ceilometer_db_password      => $ceilometer_hash['db_password'],
   ceilometer_replset_members  => mongo_hosts($nodes_hash, 'array', 'mongo'),
-  replset                     => 'ceilometer',
+  replset                     => $replset,
   use_syslog                  => $use_syslog,
   debug                       => $debug,
 }