diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index 211b2bed0732df..23987c70ca7b63 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -875,6 +875,14 @@ def setUp(self):
             self.loop = policy.new_event_loop()
             self.set_event_loop(self.loop)
 
+        def test_watcher_implementation(self):
+            loop = self.loop
+            watcher = loop._watcher
+            if unix_events.can_use_pidfd():
+                self.assertIsInstance(watcher, unix_events._PidfdChildWatcher)
+            else:
+                self.assertIsInstance(watcher, unix_events._ThreadedChildWatcher)
+
 
     class SubprocessThreadedWatcherTests(SubprocessWatcherMixin,
                                          test_utils.TestCase):