diff --git a/vpc-transit-gateway-association/variables.tf b/vpc-transit-gateway-association/variables.tf
index ee37663..e790a88 100644
--- a/vpc-transit-gateway-association/variables.tf
+++ b/vpc-transit-gateway-association/variables.tf
@@ -8,7 +8,7 @@ variable "transit_gateway_environment" {
   type        = string
 
   validation {
-    condition     = contains(local._defaults["transit-gateway-environments"], var.transit_gateway_environment)
+    condition     = contains(["services", "dev", "test", "stage", "prod", "cre"], var.transit_gateway_environment)
     error_message = "transit_gateway_environment value must be one of the valid VRF selections"
   }
 }
@@ -23,3 +23,5 @@ variable "route_table_label" {
   type        = string
   default     = "attachment"
 }
+
+