diff --git a/swh/lister/gitlab/tasks.py b/swh/lister/gitlab/tasks.py
index dbae2c3..084c8e3 100644
--- a/swh/lister/gitlab/tasks.py
+++ b/swh/lister/gitlab/tasks.py
@@ -1,65 +1,65 @@
 # Copyright (C) 2018 the Software Heritage developers
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import random
 
 from celery import group
 
 from ..core.tasks import ListerTaskBase, RangeListerTask
 from .lister import GitLabLister
 
 
 class GitLabListerTask(ListerTaskBase):
     def new_lister(self, api_baseurl='https://gitlab.com/api/v4',
                    instance='gitlab.com'):
         return GitLabLister(api_baseurl=api_baseurl, instance=instance)
 
 
 class RangeGitLabLister(GitLabListerTask, RangeListerTask):
     """Range GitLab lister (list available origins on specified range)
 
     """
     task_queue = 'swh_lister_gitlab_refresh'
 
 
 class FullGitLabRelister(GitLabListerTask):
     """Full GitLab lister (list all available origins from the api).
 
     """
     task_queue = 'swh_lister_gitlab_refresh'
 
     def run_task(self, *args, **kwargs):
         lister = self.new_lister(*args, **kwargs)
         total, _, per_page = lister.get_pages_information()
 
         ranges = []
         prev_index = None
         for index in range(0, total, per_page):
             if index is not None and prev_index is not None:
                 ranges.append((prev_index, index))
             prev_index = index
 
         random.shuffle(ranges)
         range_task = RangeGitLabLister()
         group(range_task.s(minv, maxv, *args, **kwargs)
               for minv, maxv in ranges)()
 
 
 class IncrementalGitLabLister(ListerTaskBase):
     """Incremental GitLab lister (list only new available origins).
 
     """
     task_queue = 'swh_lister_gitlab_discover'
 
     def new_lister(self, api_baseurl='https://gitlab.com/api/v4',
-                   instance='gitlab.com',):
+                   instance='gitlab.com'):
         # will invert the order of the lister's result
         return GitLabLister(instance=instance, api_baseurl=api_baseurl,
                             sort='desc')
 
     def run_task(self, *args, **kwargs):
         lister = self.new_lister(*args, **kwargs)
         # will check for existing data and exit when found
         return lister.run(min_bound=None, max_bound=None,
                           check_existence=True)