diff --git a/l4d2web/tests/test_pages.py b/l4d2web/tests/test_pages.py
index eebc6c4..1ddb2e0 100644
--- a/l4d2web/tests/test_pages.py
+++ b/l4d2web/tests/test_pages.py
@@ -771,3 +771,6 @@ def test_workshop_overlay_refresh_button_hidden_during_build(auth_client_with_se
 
     assert response.status_code == 200
     assert "Refresh from Steam" not in text
+    # Positive companion: confirm the build-running guard actually fired,
+    # otherwise the negative could pass vacuously on a broken page.
+    assert "building…" in text