diff --git a/contrib/terraform/openstack/kubespray.tf b/contrib/terraform/openstack/kubespray.tf
index c501302de..b3ea369c2 100644
--- a/contrib/terraform/openstack/kubespray.tf
+++ b/contrib/terraform/openstack/kubespray.tf
@@ -3,6 +3,7 @@ module "network" {
 
   external_net    = "${var.external_net}"
   network_name    = "${var.network_name}"
+  subnet_cidr     = "${var.subnet_cidr}"
   cluster_name    = "${var.cluster_name}"
   dns_nameservers = "${var.dns_nameservers}"
 }
diff --git a/contrib/terraform/openstack/modules/network/main.tf b/contrib/terraform/openstack/modules/network/main.tf
index 2c461c784..7c02869d4 100644
--- a/contrib/terraform/openstack/modules/network/main.tf
+++ b/contrib/terraform/openstack/modules/network/main.tf
@@ -12,7 +12,7 @@ resource "openstack_networking_network_v2" "k8s" {
 resource "openstack_networking_subnet_v2" "k8s" {
   name            = "${var.cluster_name}-internal-network"
   network_id      = "${openstack_networking_network_v2.k8s.id}"
-  cidr            = "10.0.0.0/24"
+  cidr            = "${var.subnet_cidr}"
   ip_version      = 4
   dns_nameservers = "${var.dns_nameservers}"
 }
diff --git a/contrib/terraform/openstack/modules/network/variables.tf b/contrib/terraform/openstack/modules/network/variables.tf
index a7952bced..6494358aa 100644
--- a/contrib/terraform/openstack/modules/network/variables.tf
+++ b/contrib/terraform/openstack/modules/network/variables.tf
@@ -7,3 +7,5 @@ variable "cluster_name" {}
 variable "dns_nameservers" {
   type = "list"
 }
+
+variable "subnet_cidr" {}
diff --git a/contrib/terraform/openstack/sample-inventory/cluster.tf b/contrib/terraform/openstack/sample-inventory/cluster.tf
index 7830d2159..a793bfaa5 100644
--- a/contrib/terraform/openstack/sample-inventory/cluster.tf
+++ b/contrib/terraform/openstack/sample-inventory/cluster.tf
@@ -41,5 +41,6 @@ number_of_k8s_nodes_no_floating_ip = 4
 # networking
 network_name = "<network>"
 external_net = "<UUID>"
+subnet_cidr = "<cidr>"
 floatingip_pool = "<pool>"
 
diff --git a/contrib/terraform/openstack/variables.tf b/contrib/terraform/openstack/variables.tf
index d49746c92..04e0d0c62 100644
--- a/contrib/terraform/openstack/variables.tf
+++ b/contrib/terraform/openstack/variables.tf
@@ -97,6 +97,12 @@ variable "network_name" {
   default     = "internal"
 }
 
+variable "subnet_cidr" {
+  description = "Subnet CIDR block."
+  type = "string"
+  default = "10.0.0.0/24"
+}
+
 variable "dns_nameservers" {
   description = "An array of DNS name server names used by hosts in this subnet."
   type        = "list"