--- a/mercurial/url.py	Thu May 07 17:02:20 2015 +0900
+++ b/mercurial/url.py	Thu May 07 17:15:24 2015 +0900
@@ -175,7 +175,7 @@
             self.sock.connect((self.host, self.port))
             if _generic_proxytunnel(self):
                 # we do not support client X.509 certificates
-                self.sock = sslutil.ssl_wrap_socket(self.sock, None, None,
+                self.sock = sslutil.ssl_wrap_socket(self.sock, None, None, None,
                                                     serverhostname=self.host)
         else:
             keepalive.HTTPConnection.connect(self)