diff --git a/hsds/app.py b/hsds/app.py
index 7d58fd9c..b7f27f19 100644
--- a/hsds/app.py
+++ b/hsds/app.py
@@ -156,7 +156,6 @@ def main():
     )
     parser.add_argument(
         "--bucket_name",
-        nargs=1,
         type=str,
         dest="bucket_name",
         help='Name of the bucket to use (e.g., "hsds.test").',