diff --git a/fast/stages/3-network-security/README.md b/fast/stages/3-network-security/README.md
index 4dd0fbec6e..9e5cf2ad22 100644
--- a/fast/stages/3-network-security/README.md
+++ b/fast/stages/3-network-security/README.md
@@ -161,7 +161,7 @@ ngfw_enterprise_config = {
 | [vpc_self_links](variables-fast.tf#L72) | Self link for the shared VPC. | <code title="object&#40;&#123;&#10;  dev-spoke-0  &#61; string&#10;  prod-spoke-0 &#61; string&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> | ✓ |  | <code>2-networking</code> |
 | [factories_config](variables.tf#L17) | Configuration for network resource factories. | <code title="object&#40;&#123;&#10;  cidrs &#61; optional&#40;string, &#34;data&#47;cidrs.yaml&#34;&#41;&#10;  firewall_policy_rules &#61; optional&#40;object&#40;&#123;&#10;    dev  &#61; string&#10;    prod &#61; string&#10;  &#125;&#41;&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  firewall_policy_rules &#61; &#123;&#10;    dev  &#61; &#34;data&#47;firewall-policy-rules&#47;dev&#34;&#10;    prod &#61; &#34;data&#47;firewall-policy-rules&#47;prod&#34;&#10;  &#125;&#10;&#125;">&#123;&#8230;&#125;</code> |  |
 | [host_project_ids](variables-fast.tf#L41) | Host project for the shared VPC. | <code title="object&#40;&#123;&#10;  dev-spoke-0  &#61; optional&#40;string&#41;&#10;  prod-spoke-0 &#61; optional&#40;string&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>&#123;&#125;</code> | <code>2-networking</code> |
-| [ngfw_enterprise_config](variables.tf#L35) | NGFW Enterprise configuration. | <code title="object&#40;&#123;&#10;  endpoint_zones   &#61; optional&#40;list&#40;string&#41;, &#91;&#34;europe-west1-b&#34;, &#34;europe-west1-c&#34;, &#34;europe-west1-d&#34;&#93;&#41;&#10;  quota_project_id &#61; optional&#40;string, null&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code>&#123;&#125;</code> |  |
+| [ngfw_enterprise_config](variables.tf#L35) | NGFW Enterprise configuration. | <code title="object&#40;&#123;&#10;  endpoint_zones   &#61; list&#40;string&#41;&#10;  quota_project_id &#61; optional&#40;string, null&#41;&#10;&#125;&#41;">object&#40;&#123;&#8230;&#125;&#41;</code> |  | <code title="&#123;&#10;  endpoint_zones &#61; &#91;&#10;    &#34;europe-west1-b&#34;,&#10;    &#34;europe-west1-c&#34;,&#10;    &#34;europe-west1-d&#34;&#10;  &#93;&#10;&#125;">&#123;&#8230;&#125;</code> |  |
 
 ## Outputs
 
diff --git a/fast/stages/3-network-security/variables.tf b/fast/stages/3-network-security/variables.tf
index cd1fccbc19..d291577fc7 100644
--- a/fast/stages/3-network-security/variables.tf
+++ b/fast/stages/3-network-security/variables.tf
@@ -35,9 +35,15 @@ variable "factories_config" {
 variable "ngfw_enterprise_config" {
   description = "NGFW Enterprise configuration."
   type = object({
-    endpoint_zones   = optional(list(string), ["europe-west1-b", "europe-west1-c", "europe-west1-d"])
+    endpoint_zones   = list(string)
     quota_project_id = optional(string, null)
   })
   nullable = false
-  default  = {}
+  default = {
+    endpoint_zones = [
+      "europe-west1-b",
+      "europe-west1-c",
+      "europe-west1-d"
+    ]
+  }
 }