--- ftplib.py.old	2017-01-24 15:42:40.635748400 +0100
+++ ftplib.py	2017-01-24 15:48:57.474428500 +0100
@@ -796,7 +796,8 @@
             conn, size = FTP.ntransfercmd(self, cmd, rest)
             if self._prot_p:
                 conn = self.context.wrap_socket(conn,
-                                                server_hostname=self.host)
+                                                server_hostname=self.host,
+                                                session = self.sock.session)
             return conn, size
 
         def abort(self):