diff --git a/terraform/environments/dev/main.tf b/terraform/environments/dev/main.tf
index 888fdcf..a8977b0 100644
--- a/terraform/environments/dev/main.tf
+++ b/terraform/environments/dev/main.tf
@@ -27,7 +27,7 @@ module "compute" {
   source            = "../../modules/compute"
   instance_type      = var.instance_type
   zone               = var.zone
-  frontend_subnet_id = var.frontend_subnet_id
-  backend_subnet_id  = var.backend_subnet_id
-  database_subnet_id = var.database_subnet_id
+  frontend_subnet_id = module.network.subnet_ids["frontend"]
+  backend_subnet_id  = module.network.subnet_ids["backend"]
+  database_subnet_id = module.network.subnet_ids["database"]
 }
diff --git a/terraform/environments/dev/variable.tf b/terraform/environments/dev/variable.tf
index dd94252..a8f656a 100644
--- a/terraform/environments/dev/variable.tf
+++ b/terraform/environments/dev/variable.tf
@@ -40,24 +40,6 @@ variable "ssh_source_ranges" {
   default     = "0.0.0.0/0"
 }
 
-variable "frontend_subnet_id" {
-  description = "frontend subnet id"
-  type        = string
-  default     = module.network.subnet_ids["frontend"]
-}
-
-variable "backend_subnet_id" {
-  description = "backend subnet id"
-  type        = string
-  default     = module.network.subnet_ids["backend"]
-}
-
-variable "database_subnet_id" {
-  description = "database subnet id"
-  type        = string
-  default     = module.network.subnet_ids["database"]
-}
-
 variable "zone" {
   description = "zone"
   type        = string