diff -r a6088d10d5f2 -r 3ed53b071041 mercurial/wireprotov2server.py
--- a/mercurial/wireprotov2server.py	Mon Sep 24 20:10:01 2018 -0700
+++ b/mercurial/wireprotov2server.py	Mon Sep 24 20:17:42 2018 -0700
@@ -339,7 +339,7 @@
     func, spec = COMMANDS[command]
     args = proto.getargs(spec)
 
-    return func(repo, proto, **args)
+    return func(repo, proto, **pycompat.strkwargs(args))
 
 @interfaceutil.implementer(wireprototypes.baseprotocolhandler)
 class httpv2protocolhandler(object):