diff --git a/cluster.tf b/cluster.tf
index c558e52..c5be4b6 100644
--- a/cluster.tf
+++ b/cluster.tf
@@ -15,7 +15,7 @@ resource "aws_eks_cluster" "this" {
   tags                      = var.tags
 
   vpc_config {
-    security_group_ids      = [local.cluster_security_group_id]
+    security_group_ids      = compact([local.cluster_security_group_id])
     subnet_ids              = var.subnets
     endpoint_private_access = var.cluster_endpoint_private_access
     endpoint_public_access  = var.cluster_endpoint_public_access