diff --git a/l2json/minio_obsid2time.py b/l2json/minio_obsid2time.py
index cacc6775b4189107b063a5880c30cebec60101f2..f7fe61a93fb12c9d55f1f1b92183ba5325957521 100644
--- a/l2json/minio_obsid2time.py
+++ b/l2json/minio_obsid2time.py
@@ -28,7 +28,7 @@ def main() -> None:
             tend=args.tend,
             dt=datetime.timedelta(seconds=15 * 60),
         )
-        metadata.sort(key=lambda entry: dateutil.parser.parse(entry["timestamp"]), reversed=True)  # type: ignore
+        metadata.sort(key=lambda entry: dateutil.parser.parse(entry["timestamp"]), reverse=True)
         end_times: dict[int, str] = {}
         start_times: dict[int, str] = {}
         tracking_obs_ids: set[int] = set()
diff --git a/l2json/minio_time2obsid.py b/l2json/minio_time2obsid.py
index 73787704c3931611b98c9b796e464d4ff9467a8e..3e592415673434a823a35c34f9c59fcbbdbdb41a 100644
--- a/l2json/minio_time2obsid.py
+++ b/l2json/minio_time2obsid.py
@@ -26,7 +26,7 @@ def main() -> None:
             tend=args.tend,
             dt=datetime.timedelta(seconds=15 * 60),
         )
-        metadata.sort(key=lambda entry: dateutil.parser.parse(entry["timestamp"]), reversed=True)  # type: ignore
+        metadata.sort(key=lambda entry: dateutil.parser.parse(entry["timestamp"]), reverse=True)
         end_times: dict[int, str] = {}
         start_times: dict[int, str] = {}
         tracking_obs_ids: set[int] = set()