diff --git a/bin/swh-ls-tarball-size b/bin/swh-ls-tarball-size
index 1eb8a77..ae23d47 100755
--- a/bin/swh-ls-tarball-size
+++ b/bin/swh-ls-tarball-size
@@ -1,32 +1,26 @@
 #!/usr/bin/env python3
 
-# Copyright (C) 2015  The Software Heritage developers
+# Copyright (C) 2015-2017  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 argparse
+
+import click
 import os
 
 from swh.loader.tar import file
 
 
-def parse_args():
+@click.command()
+@click.option('--mirror-root-dir', required=1, help='path to the root dir.')
+def main(mirror_root_dir):
     """Parse the configuration from the cli.
 
     """
-    cli = argparse.ArgumentParser(
-        description='Tarball listing tarballs size.')
-    cli.add_argument('--mirror-root-dir', '-m', help='path to the root dir.')
-
-    args = cli.parse_args()
-
-    return args
+    for tarpath, _ in file.archives_from(mirror_root_dir):
+        print(tarpath, os.path.getsize(tarpath))
 
 
 if __name__ == '__main__':
-    args = parse_args()
-    root_dir = args.mirror_root_dir
-
-    for tarpath, _ in file.archives_from(root_dir):
-        print('%s %s' % (tarpath, os.path.getsize(tarpath)))
+    main()