diff --git a/bin/jp2dump b/bin/jp2dump
index 08907e5..7632aff 100755
--- a/bin/jp2dump
+++ b/bin/jp2dump
@@ -15,7 +15,7 @@ parser.add_argument('-c', '--codestream',
                     help=chelp,
                     nargs=1,
                     type=int,
-                    default=0)
+                    default=[0])
 parser.add_argument('filename')
 args = parser.parse_args()
 if args.noxml: