diff --git a/tests/supervisors/test_signal.py b/tests/supervisors/test_signal.py
index 74117d797..80578a59d 100644
--- a/tests/supervisors/test_signal.py
+++ b/tests/supervisors/test_signal.py
@@ -40,6 +40,7 @@ async def wait_app(scope, receive, send):
             # ensure httpx has processed the response and result is complete
             await req
             assert req.result().status_code == 200
+            await asyncio.sleep(0.1)  # ensure shutdown is complete
 
 
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