diff --git a/contrib/malware_name_mapping/test_download_mapping.py b/contrib/malware_name_mapping/test_download_mapping.py
index 28d60887c..62479e34b 100644
--- a/contrib/malware_name_mapping/test_download_mapping.py
+++ b/contrib/malware_name_mapping/test_download_mapping.py
@@ -89,7 +89,7 @@ def test_parser_default_argument(self):
 
     def test_parser_no_default(self):
         parser = create_parser()
-        args = parser.parse_args()
+        args = parser.parse_args([])
         self.assertEqual(args.add_default, None)