diff --git a/agenda/data.py b/agenda/data.py
index d640557..462b3d9 100644
--- a/agenda/data.py
+++ b/agenda/data.py
@@ -97,8 +97,8 @@ def find_events_during_stay(
 async def time_function(
     name: str,
     func: typing.Callable[..., typing.Coroutine[typing.Any, typing.Any, typing.Any]],
-    *args,
-    **kwargs,
+    *args: typing.Any,
+    **kwargs: typing.Any,
 ) -> tuple[str, typing.Any, float, Exception | None]:
     """Time the execution of an asynchronous function."""
     start_time, result, exception = time(), None, None