diff --git a/aws_data.tf b/aws_data.tf
index 81d8da8..050df9e 100644
--- a/aws_data.tf
+++ b/aws_data.tf
@@ -15,7 +15,7 @@ data "aws_arn" "current" {
 # dummy vpc, so we can associate the zone to this account
 #---
 data "aws_vpc" "dummy_vpc" {
-  count = !(var.shared_vpc_label == null || var.shared_vpc_label == "") ? 1 : 0
+  count = local.is_shared_vpc ? 1 : 0
   filter {
     name   = "tag:Name"
     values = ["vpc0-dummy"]
diff --git a/main.tf b/main.tf
index 45f3bbe..282af9c 100644
--- a/main.tf
+++ b/main.tf
@@ -9,6 +9,7 @@
 locals {
   cluster_domain_description = format("%v EKS Cluster DNS Zone", var.cluster_name)
   cluster_domain_name        = format("%v.%v", var.cluster_name, local.vpc_domain_name)
+  is_shared_vpc              = data.aws_vpc.vpc_id.owner_id != data.aws_caller_identity.current.account_id
   region                     = var.region
   vpc_domain_name            = var.vpc_domain_name
 }
@@ -23,14 +24,14 @@ resource "aws_route53_zone" "cluster_domain" {
   force_destroy = false
 
   vpc {
-    vpc_id     = !(var.shared_vpc_label == null || var.shared_vpc_label == "") ? try(data.aws_vpc.dummy_vpc[0].id, null) : data.aws_vpc.eks_vpc.id
+    vpc_id     = local.is_shared_vpc ? try(data.aws_vpc.dummy_vpc[0].id, null) : data.aws_vpc.eks_vpc.id
     vpc_region = local.region
   }
 
   lifecycle {
     ignore_changes = [vpc]
     precondition {
-      condition     = (var.shared_vpc_label == null || var.shared_vpc_label == "") || (!(var.shared_vpc_label == null || var.shared_vpc_label == "") && !(var.vpc_domain_name == null || var.vpc_domain_name == ""))
+      condition     = (local.is_shared_vpc && !(var.vpc_domain_name == null || var.vpc_domain_name == ""))
       error_message = "var.vpc_domain_name must be provided when shared VPCs are in use."
     }
   }