diff --git a/routing/vpc-endpoints.tf b/routing/vpc-endpoints.tf
index 00fd95f..8bbdade 100644
--- a/routing/vpc-endpoints.tf
+++ b/routing/vpc-endpoints.tf
@@ -3,8 +3,8 @@
 #---
 
 locals {
-  vpce_s3       = var.enable_vpc_endpoint_s3 ? element(concat(aws_vpc_endpoint.s3[*].id, tolist("")), 0) : ""
-  vpce_dynamodb = var.enable_vpc_endpoint_dynamodb ? element(concat(aws_vpc_endpoint.dynamodb[*].id, tolist("")), 0) : ""
+  vpce_s3       = var.enable_vpc_endpoint_s3 ? element(concat(aws_vpc_endpoint.s3[*].id, tolist([""])), 0) : ""
+  vpce_dynamodb = var.enable_vpc_endpoint_dynamodb ? element(concat(aws_vpc_endpoint.dynamodb[*].id, tolist([""])), 0) : ""
 }
 
 data "aws_vpc_endpoint_service" "s3" {