diff --git a/Lib/test/test_asyncio/test_subprocess.py b/Lib/test/test_asyncio/test_subprocess.py
index 4f197f394a1..d4b71b7a5a2 100644
--- a/Lib/test/test_asyncio/test_subprocess.py
+++ b/Lib/test/test_asyncio/test_subprocess.py
@@ -87,6 +87,8 @@ def test_proc_exited(self):
         self.assertRaises(ProcessLookupError, transport.terminate)
         self.assertRaises(ProcessLookupError, transport.kill)
 
+        transport.close()
+
 
 class SubprocessMixin: