diff --git a/ci/environments/scenario012-standalone.yaml b/ci/environments/scenario012-standalone.yaml
index 9f631d7c2d..22ecf236a0 100644
--- a/ci/environments/scenario012-standalone.yaml
+++ b/ci/environments/scenario012-standalone.yaml
@@ -32,4 +32,3 @@ parameter_defaults:
   NeutronFlatNetworks: datacentre
   NeutronNetworkVLANRanges: 'datacentre:500:599,tenant:300:399'
   ML2HostConfigs: { "net-ans-br": { "ansible_network_os": "openvswitch", "ansible_host": "127.0.0.1", "ansible_user": "root", "ansible_ssh_private_key_file": "/etc/puppet/ci-key"}}
-  NeutronBridgeMappings: 'datacentre:br-ex,tenant:br-tenant'