diff --git a/main.tf b/main.tf
index 8a5bf65..256c3bb 100644
--- a/main.tf
+++ b/main.tf
@@ -104,8 +104,11 @@ resource "google_compute_instance_from_template" "bastion_vm" {
 
   source_instance_template = module.instance_template.self_link
 
-  params {
-    resource_manager_tags = var.resource_manager_tags
+  dynamic "params" {
+    for_each = var.resource_manager_tags == null ? [] : [1]
+    content {
+      resource_manager_tags = var.resource_manager_tags
+    }
   }
 }