diff --git a/src/python/grpcio_tests/tests/unit/_interceptor_test.py b/src/python/grpcio_tests/tests/unit/_interceptor_test.py
index 45a9fa30833..20e546bf0de 100644
--- a/src/python/grpcio_tests/tests/unit/_interceptor_test.py
+++ b/src/python/grpcio_tests/tests/unit/_interceptor_test.py
@@ -563,7 +563,8 @@ class InterceptorTest(unittest.TestCase):
 
     # NOTE: The single-threaded unary-stream path does not support the
     # grpc.Future interface, so this test does not apply.
-    @unittest.skipIf(os.getenv("GRPC_SINGLE_THREADED_UNARY_STREAM"), "Not supported.")
+    @unittest.skipIf(
+        os.getenv("GRPC_SINGLE_THREADED_UNARY_STREAM"), "Not supported.")
     def testInterceptedUnaryRequestStreamResponseWithError(self):
         request = _EXCEPTION_REQUEST