diff --git a/modules/compute/main.tf b/modules/compute/main.tf
index 793128f..2fc3959 100644
--- a/modules/compute/main.tf
+++ b/modules/compute/main.tf
@@ -10,7 +10,7 @@ resource "google_compute_instance" "vm-front" {
     }
   }
   network_interface {
-    subnetwork = "google_compute_network.subnet1.id"
+    subnetwork = var.sub1
     access_config {} # IP publique
   }
 
@@ -35,7 +35,7 @@ resource "google_compute_instance" "vm-back" {
   }
 
   network_interface {
-    subnetwork = "google_compute_network.subnet2.id"
+    subnetwork = var.sub2
     access_config {} # IP publique
   }
 
@@ -59,7 +59,7 @@ resource "google_compute_instance" "vm-database" {
   }
 
   network_interface {
-    subnetwork = "google_compute_network.subnet3.id"
+    subnetwork = var.sub3
     access_config {} # IP publique
   }