diff --git a/swh/loader/package/archive/tasks.py b/swh/loader/package/archive/tasks.py
index 76d0563..4313326 100644
--- a/swh/loader/package/archive/tasks.py
+++ b/swh/loader/package/archive/tasks.py
@@ -1,15 +1,16 @@
 # Copyright (C) 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
 
 from celery import shared_task
 
 from swh.loader.package.archive.loader import ArchiveLoader
 
 
 @shared_task(name=__name__ + '.LoadArchive')
-def load_archive_files(url=None, artifacts=None, identity_artifact_keys=None):
+def load_archive_files(
+        *, url=None, artifacts=None, identity_artifact_keys=None):
     """Load archive's artifacts (e.g gnu, etc...)"""
     return ArchiveLoader(url, artifacts,
                          identity_artifact_keys=identity_artifact_keys).load()
diff --git a/swh/loader/package/archive/tests/test_tasks.py b/swh/loader/package/archive/tests/test_tasks.py
index 798281b..cb56c57 100644
--- a/swh/loader/package/archive/tests/test_tasks.py
+++ b/swh/loader/package/archive/tests/test_tasks.py
@@ -1,19 +1,22 @@
 # Copyright (C) 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
 
 
 def test_archive_loader(mocker, swh_app, celery_session_worker, swh_config):
     mock_loader = mocker.patch(
         'swh.loader.package.archive.loader.ArchiveLoader.load')
     mock_loader.return_value = {'status': 'eventful'}
 
     res = swh_app.send_task(
         'swh.loader.package.archive.tasks.LoadArchive',
-        (), dict(url='some-url', artifacts=[]))
+        kwargs={
+            'url': 'some-url',
+            'artifacts': []
+        })
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'eventful'}
diff --git a/swh/loader/package/debian/tests/test_tasks.py b/swh/loader/package/debian/tests/test_tasks.py
index 82a3374..a8b2800 100644
--- a/swh/loader/package/debian/tests/test_tasks.py
+++ b/swh/loader/package/debian/tests/test_tasks.py
@@ -1,19 +1,23 @@
 # Copyright (C) 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
 
 
 def test_debian_loader(mocker, swh_app, celery_session_worker, swh_config):
     mock_loader = mocker.patch(
         'swh.loader.package.debian.loader.DebianLoader.load')
     mock_loader.return_value = {'status': 'eventful'}
 
     res = swh_app.send_task(
         'swh.loader.package.debian.tasks.LoadDebian',
-        (), dict(url='some-url', date='some-date', packages={}))
+        kwargs={
+            'url': 'some-url',
+            'date': 'some-date',
+            'packages': {}
+        })
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'eventful'}
diff --git a/swh/loader/package/deposit/tests/test_tasks.py b/swh/loader/package/deposit/tests/test_tasks.py
index f1fe0aa..9e65609 100644
--- a/swh/loader/package/deposit/tests/test_tasks.py
+++ b/swh/loader/package/deposit/tests/test_tasks.py
@@ -1,19 +1,22 @@
 # Copyright (C) 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
 
 
 def test_deposit_loader(mocker, swh_app, celery_session_worker, swh_config):
     mock_loader = mocker.patch(
         'swh.loader.package.deposit.loader.DepositLoader.load')
     mock_loader.return_value = {'status': 'eventful'}
 
     res = swh_app.send_task(
         'swh.loader.package.deposit.tasks.LoadDeposit',
-        (), dict(url='some-url', deposit_id='some-d-id'))
+        kwargs={
+            'url': 'some-url',
+            'deposit_id': 'some-d-id',
+        })
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'eventful'}
diff --git a/swh/loader/package/npm/tests/test_tasks.py b/swh/loader/package/npm/tests/test_tasks.py
index f407412..21687ef 100644
--- a/swh/loader/package/npm/tests/test_tasks.py
+++ b/swh/loader/package/npm/tests/test_tasks.py
@@ -1,18 +1,18 @@
 # Copyright (C) 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
 
 
 def test_npm_loader(mocker, swh_app, celery_session_worker, swh_config):
     mock_loader = mocker.patch('swh.loader.package.npm.loader.NpmLoader.load')
     mock_loader.return_value = {'status': 'eventful'}
 
     res = swh_app.send_task(
         'swh.loader.package.npm.tasks.LoadNpm',
-        (), dict(url='https://www.npmjs.com/package/some-package'))
+        kwargs=dict(url='https://www.npmjs.com/package/some-package'))
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'eventful'}
diff --git a/swh/loader/package/pypi/tests/test_tasks.py b/swh/loader/package/pypi/tests/test_tasks.py
index 2711d57..fcd2aa0 100644
--- a/swh/loader/package/pypi/tests/test_tasks.py
+++ b/swh/loader/package/pypi/tests/test_tasks.py
@@ -1,19 +1,19 @@
 # Copyright (C) 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
 
 
 def test_pypi_loader(mocker, swh_app, celery_session_worker, swh_config):
     mock_loader = mocker.patch(
         'swh.loader.package.pypi.loader.PyPILoader.load')
     mock_loader.return_value = {'status': 'eventful'}
 
     res = swh_app.send_task(
         'swh.loader.package.pypi.tasks.LoadPyPI',
-        (), dict(url='some-url'))
+        kwargs=dict(url='some-url'))
     assert res
     res.wait()
     assert res.successful()
 
     assert res.result == {'status': 'eventful'}