diff --git a/swh/loader/cvs/tasks.py b/swh/loader/cvs/tasks.py
--- a/swh/loader/cvs/tasks.py
+++ b/swh/loader/cvs/tasks.py
@@ -22,7 +22,7 @@
 @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,