diff --git a/de/heat-templates/top.yaml b/de/heat-templates/top.yaml
index b0ce896..8a2ba4d 100644
--- a/de/heat-templates/top.yaml
+++ b/de/heat-templates/top.yaml
@@ -36,6 +36,9 @@
     default: 1200
   cluster_public_key:
     type: string
+  private_floating_network_cidr:
+    type: string
+    default: '10.11.12.0/24'
   worker_metadata:
     type: json
   cmp_metadata:
@@ -80,7 +83,7 @@
     type: OS::Neutron::Subnet
     properties:
       network: { get_resource: private_floating_network }
-      cidr: 10.11.12.0/24
+      cidr: { get_param: private_floating_network_cidr }
       enable_dhcp: false
       gateway_ip: ~
 
@@ -198,3 +201,5 @@
   worker_private_floating_ips:
     description: IPs might be used as gateway
     value: { get_attr: [workers, server_private_floating_ip] }
+  private_floating_cidr:
+    value: { get_param: private_floating_network_cidr }