diff --git a/swh/lister/github/lister.py b/swh/lister/github/lister.py
index 7d05579..173eb9d 100644
--- a/swh/lister/github/lister.py
+++ b/swh/lister/github/lister.py
@@ -1,49 +1,50 @@
 # Copyright (C) 2017-2019 the Software Heritage developers
 # License: GNU General Public License version 3, or any later version
 # See top-level LICENSE file for more information
 
 import re
 import time
 
 from swh.lister.core.indexing_lister import IndexingHttpLister
 from swh.lister.github.models import GitHubModel
 
 
 class GitHubLister(IndexingHttpLister):
     PATH_TEMPLATE = '/repositories?since=%d'
     MODEL = GitHubModel
+    DEFAULT_URL = 'https://api.github.com'
     API_URL_INDEX_RE = re.compile(r'^.*/repositories\?since=(\d+)')
     LISTER_NAME = 'github'
     instance = 'github'  # There is only 1 instance of such lister
 
     def get_model_from_repo(self, repo):
         return {
             'uid': repo['id'],
             'indexable': repo['id'],
             'name': repo['name'],
             'full_name': repo['full_name'],
             'html_url': repo['html_url'],
             'origin_url': repo['html_url'],
             'origin_type': 'git',
             'fork': repo['fork'],
         }
 
     def transport_quota_check(self, response):
         reqs_remaining = int(response.headers['X-RateLimit-Remaining'])
         if response.status_code == 403 and reqs_remaining == 0:
             reset_at = int(response.headers['X-RateLimit-Reset'])
             delay = min(reset_at - time.time(), 3600)
             return True, delay
         return False, 0
 
     def get_next_target_from_response(self, response):
         if 'next' in response.links:
             next_url = response.links['next']['url']
             return int(self.API_URL_INDEX_RE.match(next_url).group(1))
 
     def transport_response_simplified(self, response):
         repos = response.json()
         return [self.get_model_from_repo(repo) for repo in repos]
 
     def request_headers(self):
         return {'Accept': 'application/vnd.github.v3+json'}