diff --git a/python/tests/server/test_worker.py b/python/tests/server/test_worker.py
index 5acb532123..d7aa69cad1 100644
--- a/python/tests/server/test_worker.py
+++ b/python/tests/server/test_worker.py
@@ -91,7 +91,7 @@
         },
     ),
     (
-        WorkerConfig("emit_metric_async", min_python=(3, 11)),
+        WorkerConfig("emit_metric_async", min_python=(3, 11), is_async=True),
         {"name": ST_NAMES},
         {
             "foo": 123,