diff --git a/manifests/agents/ml2/ovs.pp b/manifests/agents/ml2/ovs.pp
index 0d496db20..d9306a8fb 100644
--- a/manifests/agents/ml2/ovs.pp
+++ b/manifests/agents/ml2/ovs.pp
@@ -279,7 +279,7 @@ class neutron::agents::ml2::ovs (
 
     # Set config for bridges that we're going to create
     # The OVS neutron plugin will talk in terms of the networks in the bridge_mappings
-    $br_map_str = join($bridge_mappings, ',')
+    $br_map_str = join(any2array($bridge_mappings), ',')
     neutron_agent_ovs {
       'ovs/bridge_mappings': value => $br_map_str;
     }