diff --git a/python/ray/tests/test_reference_counting.py b/python/ray/tests/test_reference_counting.py
index 78114a80d..1d0466fb0 100644
--- a/python/ray/tests/test_reference_counting.py
+++ b/python/ray/tests/test_reference_counting.py
@@ -1,14 +1,16 @@
 # coding: utf-8
-import os
-import json
 import copy
-import tempfile
-import numpy as np
-import time
-import pytest
+import json
 import logging
+import os
+import tempfile
+import time
 import uuid
 
+import numpy as np
+
+import pytest
+
 import ray
 import ray.cluster_utils
 import ray.test_utils