diff --git a/modules/acm/creds.tf b/modules/acm/creds.tf
index f11e749fe..fb8b5fb37 100644
--- a/modules/acm/creds.tf
+++ b/modules/acm/creds.tf
@@ -107,6 +107,7 @@ resource "google_service_account" "acm_metrics_writer_sa" {
 }
 
 resource "google_project_iam_member" "acm_metrics_writer_sa_role" {
+  count   = var.create_metrics_gcp_sa ? 1 : 0
   project = var.project_id
   role    = "roles/monitoring.metricWriter"
   member  = "serviceAccount:${google_service_account.acm_metrics_writer_sa[0].email}"
diff --git a/modules/acm/outputs.tf b/modules/acm/outputs.tf
index 3e9594cee..1a82e7603 100644
--- a/modules/acm/outputs.tf
+++ b/modules/acm/outputs.tf
@@ -34,5 +34,5 @@ output "wait" {
 
 output "acm_metrics_writer_sa" {
   description = "The ACM metrics writer Service Account"
-  value       = google_service_account.acm_metrics_writer_sa[0].email
+  value       = var.create_metrics_gcp_sa ? google_service_account.acm_metrics_writer_sa[0].email : null
 }