diff --git a/scripts/importer.py b/scripts/importer.py
index 3a2c6a9f9..c07fec0ec 100755
--- a/scripts/importer.py
+++ b/scripts/importer.py
@@ -75,6 +75,7 @@ def get_args():
         'browser',
         help="Which browser? {%(choices)s}",
         choices=browser_default_input_format.keys(),
+        nargs='?',
         metavar='browser')
     parser.add_argument(
         '-i',