diff --git a/tests/service/test_autotune_service.py b/tests/service/test_autotune_service.py
index 2f5cddd03..f0b034b43 100644
--- a/tests/service/test_autotune_service.py
+++ b/tests/service/test_autotune_service.py
@@ -292,7 +292,7 @@ def test_autotune_service(self):
 
         mock_objs = []
         pool = multiprocessing.Pool(nprocs * len(model_dict))
-        results = dict([(key, []) for key in model_dict.keys()])
+        results = {key: [] for key in model_dict.keys()}
         for (model_name, (tensor_list, spans)) in model_dict.items():
             pg_init_method = "file:///tmp/.bagua.unittest.autotune.{}".format(model_name)
             for i in range(nprocs):