diff --git a/python/ray/tests/conftest.py b/python/ray/tests/conftest.py
index e6b05f9ea..3c5ce095b 100644
--- a/python/ray/tests/conftest.py
+++ b/python/ray/tests/conftest.py
@@ -162,6 +162,7 @@ def call_ray_start(request):
     # Kill the Ray cluster.
     subprocess.check_output(["ray", "stop"])
 
+
 @pytest.fixture
 def call_ray_stop_only():
     yield