Index: tests/test_process.py
--- tests/test_process.py.orig
+++ tests/test_process.py
@@ -912,7 +912,7 @@ class Test_UV_Process_Delayed(tb.UVTestCase):
                 stdin=subprocess.PIPE,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                __uvloop_sleep_after_fork=True))
+                uvloop_sleep_after_fork=True))
         self.assertIsNot(transport, None)
         self.assertEqual(transport.get_returncode(), 0)
         self.assertEqual(
@@ -931,7 +931,7 @@ class Test_UV_Process_Delayed(tb.UVTestCase):
                 stdin=None,
                 stdout=subprocess.PIPE,
                 stderr=subprocess.PIPE,
-                __uvloop_sleep_after_fork=True))
+                uvloop_sleep_after_fork=True))
         self.assertIsNot(transport, None)
         self.assertEqual(transport.get_returncode(), 0)
         self.assertEqual(
