diff --git a/environments/network-environment.j2.yaml b/environments/network-environment.j2.yaml
index 43c39007c1..4d3016f536 100644
--- a/environments/network-environment.j2.yaml
+++ b/environments/network-environment.j2.yaml
@@ -47,7 +47,10 @@ parameter_defaults:
   # Customize the VLAN ID to match the local environment
   {{network.name}}NetworkVlanID: {{network.vlan}}
 {%-     endif %}
-{%-     if network.routes %}
+{%-     if network.ipv6|default(false) and network.routes_ipv6 %}
+  # Routes to add to host_routes property of the subnets in neutron.
+  {{network.name}}Routes: {{network.routes_ipv6|default([])}}
+{%-     elif network.routes %}
   # Routes to add to host_routes property of the subnets in neutron.
   {{network.name}}Routes: {{network.routes|default([])}}
 {%-     endif %}