diff --git a/infra/terraform/test_fixtures/terraform-google-kubernetes-engine.tf b/infra/terraform/test_fixtures/terraform-google-kubernetes-engine.tf
index cbe4b7c..9828bc5 100644
--- a/infra/terraform/test_fixtures/terraform-google-kubernetes-engine.tf
+++ b/infra/terraform/test_fixtures/terraform-google-kubernetes-engine.tf
@@ -67,7 +67,7 @@ resource "google_project_iam_binding" "ci_kubernetes_engine_kms_access" {
   role    = "roles/cloudkms.cryptoKeyEncrypterDecrypter"
 
   members = [
-    "serviceAccount:service-${google_project.ci_kubernetes_engine.id}@container-engine-robot.iam.gserviceaccount.com",
+    "serviceAccount:service-${google_project.ci_kubernetes_engine.number}@container-engine-robot.iam.gserviceaccount.com",
   ]
 }