diff --git a/swh/loader/cvs/tasks.py b/swh/loader/cvs/tasks.py
index deb0b23..bd0bfc8 100644
--- a/swh/loader/cvs/tasks.py
+++ b/swh/loader/cvs/tasks.py
@@ -1,51 +1,51 @@
 # Copyright (C) 2015-2021  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU Affero General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 from datetime import datetime
 from typing import Optional
 
 from celery import shared_task
 import iso8601
 
 from .loader import CvsLoader
 
 
 def convert_to_datetime(date: Optional[str]) -> Optional[datetime]:
     try:
         return iso8601.parse_date(date)
     except Exception:
         return None
 
 
 @shared_task(name=__name__ + ".LoadCvsRepository")
 def load_cvs(
     *,
-    url: Optional[str] = None,
+    url: str,
     origin_url: Optional[str] = None,
     destination_path: Optional[str] = None,
     swh_revision: Optional[str] = None,
     visit_date: Optional[str] = None,
 ):
     """Import a CVS repository
 
     Args:
         - url: (mandatory) CVS's repository url to ingest data from
         - origin_url: Optional original url override to use as origin reference
             in the archive. If not provided, "url" is used as origin.
         - destination_path: (optional) root directory to
           locally retrieve svn's data
         - swh_revision: (optional) extra revision hex to
           start from. See swh.loader.svn.CvsLoader.process
           docstring
         - visit_date: Optional date to override the visit date
     """
     loader = CvsLoader.from_configfile(
         url=url,
         origin_url=origin_url,
         destination_path=destination_path,
         swh_revision=swh_revision,
         visit_date=convert_to_datetime(visit_date),
     )
     return loader.load()