diff --git a/swh/core/cli/__init__.py b/swh/core/cli/__init__.py
index ff911fc..d9c90c0 100644
--- a/swh/core/cli/__init__.py
+++ b/swh/core/cli/__init__.py
@@ -1,42 +1,42 @@
 # 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
 
 import click
 import logging
 import pkg_resources
 
 LOG_LEVEL_NAMES = ['NOTSET', 'DEBUG', 'INFO', 'WARNING', 'ERROR', 'CRITICAL']
 
 CONTEXT_SETTINGS = dict(help_option_names=['-h', '--help'])
 
 logger = logging.getLogger(__name__)
 
 
 @click.group(context_settings=CONTEXT_SETTINGS)
 @click.option('--log-level', '-l', default='INFO',
               type=click.Choice(LOG_LEVEL_NAMES),
               help="Log level (default to INFO)")
 @click.pass_context
 def swh(ctx, log_level):
-    """Command line interface for Software Heritage
+    """Command line interface for Software Heritage.
     """
     log_level = logging.getLevelName(log_level)
-    logger.setLevel(log_level)
+    logging.root.setLevel(log_level)
     ctx.ensure_object(dict)
     ctx.obj['log_level'] = log_level
 
 
 def main():
     logging.basicConfig()
     # load plugins that define cli sub commands
     for entry_point in pkg_resources.iter_entry_points('swh.cli.subcommands'):
         cmd = entry_point.load()
         swh.add_command(cmd, name=entry_point.name)
 
     return swh(auto_envvar_prefix='SWH')
 
 
 if __name__ == '__main__':
     main()