diff --git a/tests/asgi/tests.py b/tests/asgi/tests.py
index fca2ef540fb5..cf0cdeeba8fd 100644
--- a/tests/asgi/tests.py
+++ b/tests/asgi/tests.py
@@ -318,7 +318,6 @@ class SignalHandler:
 
             threads = []
 
-            @async_unsafe
             def __call__(self, **kwargs):
                 self.threads.append(threading.current_thread())