diff --git a/src/apscheduler/_schedulers/async_.py b/src/apscheduler/_schedulers/async_.py
index 298fc4c8..28ba04c5 100644
--- a/src/apscheduler/_schedulers/async_.py
+++ b/src/apscheduler/_schedulers/async_.py
@@ -81,7 +81,7 @@
 _microsecond_delta = timedelta(microseconds=1)
 _zero_timedelta = timedelta()
 
-TaskType: TypeAlias = "Task | str | Callable"
+TaskType: TypeAlias = "Task | str | Callable[..., Any]"
 T = TypeVar("T")