--- a/mercurial/url.py	Wed May 25 16:09:07 2016 -0700
+++ b/mercurial/url.py	Wed May 25 19:43:22 2016 -0700
@@ -354,8 +354,8 @@
                 _generic_proxytunnel(self)
                 host = self.realhostport.rsplit(':', 1)[0]
             self.sock = sslutil.wrapsocket(
-                self.sock, self.key_file, self.cert_file, serverhostname=host,
-                **sslutil.sslkwargs(self.ui, host))
+                self.sock, self.key_file, self.cert_file, ui=self.ui,
+                serverhostname=host, **sslutil.sslkwargs(self.ui, host))
             sslutil.validatesocket(self.sock)
 
     class httpshandler(keepalive.KeepAliveHandler, urlreq.httpshandler):