diff --git a/Lib/asyncio/base_subprocess.py b/Lib/asyncio/base_subprocess.py
index f5e7dfec136..81c6f1a71d3 100644
--- a/Lib/asyncio/base_subprocess.py
+++ b/Lib/asyncio/base_subprocess.py
@@ -117,12 +117,15 @@ class BaseSubprocessTransport(transports.SubprocessTransport):
             proc.stderr.close()
         if proc.stdin:
             proc.stdin.close()
+
         try:
             proc.kill()
         except ProcessLookupError:
             pass
         self._returncode = proc.wait()
 
+        self.close()
+
     @coroutine
     def _post_init(self):
         try: