diff --git a/cmd/internal/testacc/testdata/bootstrap/main.tf b/cmd/internal/testacc/testdata/bootstrap/main.tf
index d07b9f66..e5304501 100644
--- a/cmd/internal/testacc/testdata/bootstrap/main.tf
+++ b/cmd/internal/testacc/testdata/bootstrap/main.tf
@@ -73,5 +73,9 @@ module "noop" {
     workspace   = var.run_id
     project     = var.run_id
     run_id      = var.run_id
+    # The acceptance backend defines no mandatory tags.
+    meshstack = {
+      tag_schema = { mandatory = { payment_method = {} } }
+    }
   }
 }