diff --git a/modules/instance_template/main.tf b/modules/instance_template/main.tf
index 8b076508..fe202049 100644
--- a/modules/instance_template/main.tf
+++ b/modules/instance_template/main.tf
@@ -96,7 +96,7 @@ resource "google_compute_instance_template" "tpl" {
   }
 
   dynamic "service_account" {
-    for_each = [var.service_account]
+    for_each = var.service_account == null ? [] : [var.service_account]
     content {
       email  = lookup(service_account.value, "email", null)
       scopes = lookup(service_account.value, "scopes", null)