--- a/mercurial/keepalive.py	Wed Feb 24 20:45:47 2016 +0000
+++ b/mercurial/keepalive.py	Sun Feb 28 00:00:13 2016 -0800
@@ -345,7 +345,7 @@
                     h.putheader('Content-length', '%d' % len(data))
             else:
                 h.putrequest('GET', req.get_selector(), **skipheaders)
-        except (socket.error) as err:
+        except socket.error as err:
             raise urllib2.URLError(err)
         for k, v in headers.items():
             h.putheader(k, v)