diff --git a/security_groups.tf b/security_groups.tf
index f14eae0..6d4a61c 100644
--- a/security_groups.tf
+++ b/security_groups.tf
@@ -75,13 +75,13 @@ resource "aws_security_group" "all_worker_mgmt" {
 }
 
 resource "aws_security_group" "extra_cluster_sg" {
-  name        = format("%v%v-extra", local._prefixes["eks-security-group"], var.cluster_name)
+  name        = format("%v%v-extra", local.prefixes["eks-security-group"], var.cluster_name)
   description = format("Security group for additional access for EKS cluster %v", var.cluster_name)
 
   tags = merge(
     local.base_tags,
     var.tags,
-    { "Name" = format("%v%v-extra", local._prefixes["eks-security-group"], var.cluster_name) },
+    { "Name" = format("%v%v-extra", local.prefixes["eks-security-group"], var.cluster_name) },
   )
 
   vpc_id = data.aws_vpc.eks_vpc.id