diff --git a/swh/loader/git/tasks.py b/swh/loader/git/tasks.py
index 22216c1..1bbaffd 100644
--- a/swh/loader/git/tasks.py
+++ b/swh/loader/git/tasks.py
@@ -1,52 +1,53 @@
 # Copyright (C) 2015-2019  The Software Heritage developers
 # See the AUTHORS file at the top-level directory of this distribution
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import dateutil.parser
 
 from typing import Any, Dict, Optional
 
 from celery import shared_task
 
 from swh.loader.git.from_disk import GitLoaderFromDisk, GitLoaderFromArchive
 from swh.loader.git.loader import GitLoader
 
 
 @shared_task(name=__name__ + '.UpdateGitRepository')
-def load_git(url: str, base_url: Optional[str] = None) -> Dict[str, Any]:
+def load_git(*, url: str, base_url: Optional[str] = None) -> Dict[str, Any]:
     """Import a git repository from a remote location
 
     """
     loader = GitLoader(url, base_url=base_url)
     return loader.load()
 
 
 @shared_task(name=__name__ + '.LoadDiskGitRepository')
-def load_git_from_dir(url: str, directory: str, date: str) -> Dict[str, Any]:
+def load_git_from_dir(
+        *, url: str, directory: str, date: str) -> Dict[str, Any]:
     """Import a git repository from a local repository
 
        Import a git repository, cloned in `directory` from `origin_url` at
         `date`.
 
     """
     visit_date = dateutil.parser.parse(date)
     loader = GitLoaderFromDisk(
         url, directory=directory, visit_date=visit_date)
     return loader.load()
 
 
 @shared_task(name=__name__ + '.UncompressAndLoadDiskGitRepository')
 def load_git_from_zip(
-        url: str, archive_path: str, date: str) -> Dict[str, Any]:
+        *, url: str, archive_path: str, date: str) -> Dict[str, Any]:
     """Import a git repository from a zip archive
 
     1. Uncompress an archive repository in a local and temporary folder
     2. Load it through the git disk loader
     3. Clean up the temporary folder
 
     """
     visit_date = dateutil.parser.parse(date)
     loader = GitLoaderFromArchive(
         url, archive_path=archive_path, visit_date=visit_date)
     return loader.load()