diff --git a/fsverity/fsverity_manifest_generator.py b/fsverity/fsverity_manifest_generator.py
index 79be591..181758a 100644
--- a/fsverity/fsverity_manifest_generator.py
+++ b/fsverity/fsverity_manifest_generator.py
@@ -50,7 +50,7 @@
       required=True)
   p.add_argument(
       'inputs',
-      nargs='+',
+      nargs='*',
       help='input file for the build manifest')
   args = p.parse_args(sys.argv[1:])