diff --git a/test/local_test_pet.py b/test/local_test_pet.py
index f043d16a5c7a9d7d45db8ce91864a8c5325876b9..920aea654c6afc159e4ff1fab031b1c29ea69528 100644
--- a/test/local_test_pet.py
+++ b/test/local_test_pet.py
@@ -51,7 +51,7 @@ if __name__ == "__main__":
         dest="devices",
         help="GPU id of running. if more than one, use spacing to separate.",
         nargs="+",
-        default=0,
+        default=[0],
         type=int)
     args = parser.parse_args()