diff --git a/Lib/asyncio/unix_events.py b/Lib/asyncio/unix_events.py
index 9f4005c..97f9add 100644
--- a/Lib/asyncio/unix_events.py
+++ b/Lib/asyncio/unix_events.py
@@ -177,7 +177,11 @@
             transp = _UnixSubprocessTransport(self, protocol, args, shell,
                                               stdin, stdout, stderr, bufsize,
                                               extra=extra, **kwargs)
-            yield from transp._post_init()
+            try:
+                yield from transp._post_init()
+            except:
+                transp.close()
+                raise
             watcher.add_child_handler(transp.get_pid(),
                                       self._child_watcher_callback, transp)
 
diff --git a/Lib/asyncio/windows_events.py b/Lib/asyncio/windows_events.py
index 9d496f2..82d0966 100644
--- a/Lib/asyncio/windows_events.py
+++ b/Lib/asyncio/windows_events.py
@@ -272,7 +272,12 @@
         transp = _WindowsSubprocessTransport(self, protocol, args, shell,
                                              stdin, stdout, stderr, bufsize,
                                              extra=extra, **kwargs)
-        yield from transp._post_init()
+        try:
+            yield from transp._post_init()
+        except:
+            transp.close()
+            raise
+
         return transp