diff --git a/environments/network-environment-v6.j2.yaml b/environments/network-environment-v6.j2.yaml
index a95461af2b..e382f22217 100644
--- a/environments/network-environment-v6.j2.yaml
+++ b/environments/network-environment-v6.j2.yaml
@@ -73,14 +73,14 @@ parameter_defaults:
   {{network.name}}SubnetCidr_{{subnet}}: {{network.subnets[subnet]['ipv6_subnet']}}
   {{network.name}}AllocationPools_{{subnet}}: {{network.subnets[subnet]['ipv6_allocation_pools']}}
   {{network.name}}InterfaceDefaultRoute_{{subnet}}: {{network.subnets[subnet]['gateway_ipv6']}}
-{%-             if network.subnets[subnet][routes_ipv6] %}
+{%-             if network.subnets[subnet]['routes_ipv6'] is defined %}
   {{network.name}}Routes_{{subnet}}: {{network.subnets[subnet]['routes_ipv6']|default([])}}
 {%-             endif %}
 {%-         else %}
   {{network.name}}SubnetCidr_{{subnet}}: {{network.subnets[subnet]['ip_subnet']}}
   {{network.name}}AllocationPools_{{subnet}}: {{network.subnets[subnet]['allocation_pools']}}
   {{network.name}}InterfaceDefaultRoute_{{subnet}}: {{network.subnets[subnet]['gateway_ip']}}
-{%-             if network.subnets[subnet][routes] %}
+{%-             if network.subnets[subnet]['routes'] is defined %}
   {{network.name}}Routes_{{subnet}}: {{network.subnets[subnet]['routes']|default([])}}
 {%-             endif %}
 {%-         endif %}
diff --git a/environments/network-environment.j2.yaml b/environments/network-environment.j2.yaml
index 60a23c25d1..17cc57c0f2 100644
--- a/environments/network-environment.j2.yaml
+++ b/environments/network-environment.j2.yaml
@@ -67,14 +67,14 @@ parameter_defaults:
   {{network.name}}SubnetCidr_{{subnet}}: {{network.subnets[subnet]['ipv6_subnet']}}
   {{network.name}}AllocationPools_{{subnet}}: {{network.subnets[subnet]['ipv6_allocation_pools']}}
   {{network.name}}InterfaceDefaultRoute_{{subnet}}: {{network.subnets[subnet]['gateway_ipv6']}}
-{%-             if network.subnets[subnet][routes_ipv6] %}
+{%-             if network.subnets[subnet]['routes_ipv6'] is defined %}
   {{network.name}}Routes_{{subnet}}: {{network.subnets[subnet]['routes_ipv6']|default([])}}
 {%-             endif %}
 {%-         else %}
   {{network.name}}SubnetCidr_{{subnet}}: {{network.subnets[subnet]['ip_subnet']}}
   {{network.name}}AllocationPools_{{subnet}}: {{network.subnets[subnet]['allocation_pools']}}
   {{network.name}}InterfaceDefaultRoute_{{subnet}}: {{network.subnets[subnet]['gateway_ip']}}
-{%-             if network.subnets[subnet][routes] %}
+{%-             if network.subnets[subnet]['routes'] is defined %}
   {{network.name}}Routes_{{subnet}}: {{network.subnets[subnet]['routes']|default([])}}
 {%-             endif %}
 {%-         endif %}