diff --git a/vpc-transit-gateway-association/associate.tf b/vpc-transit-gateway-association/associate.tf
index 250d6b4..67b691a 100644
--- a/vpc-transit-gateway-association/associate.tf
+++ b/vpc-transit-gateway-association/associate.tf
@@ -4,7 +4,7 @@
 resource "aws_ec2_transit_gateway_vpc_attachment" "vpc_attachment" {
   count = var.transit_gateway_routing_type == "self" ? 1 : 0
   #  subnet_ids                                      = [for sn in module.subnets.private_subnets_ids : sn.id if lookup(sn.tags, "boc:vpc:route-table", null) == "attachment"]
-  subnet_ids                                      = [for k, v in var.private_subnets_ids : k]
+  subnet_ids                                      = [for k, v in var.private_subnets_ids : v.id]
   transit_gateway_id                              = data.aws_ec2_transit_gateway.gateway_self.id
   vpc_id                                          = var.vpc_id
   dns_support                                     = "enable"