diff -r 344fd1fe237b -r c97a750c28a5 mercurial/hgweb/server.py
--- a/mercurial/hgweb/server.py	Fri Jun 30 03:45:44 2017 +0200
+++ b/mercurial/hgweb/server.py	Fri Jun 30 03:45:45 2017 +0200
@@ -283,7 +283,7 @@
         self.prefix = prefix
 
         alog = openlog(ui.config('web', 'accesslog'), ui.fout)
-        elog = openlog(ui.config('web', 'errorlog', '-'), ui.ferr)
+        elog = openlog(ui.config('web', 'errorlog'), ui.ferr)
         self.accesslog = alog
         self.errorlog = elog