diff --git a/ansible/roles/neutron/templates/l3_agent.ini.j2 b/ansible/roles/neutron/templates/l3_agent.ini.j2
index 78c4b39c84..1bb7234ee2 100644
--- a/ansible/roles/neutron/templates/l3_agent.ini.j2
+++ b/ansible/roles/neutron/templates/l3_agent.ini.j2
@@ -1,3 +1,4 @@
 # l3_agent.ini
 [DEFAULT]
 agent_mode = legacy
+external_network_bridge =