diff -r 90ca4986616c -r 038bcb759b75 mercurial/wireprotoserver.py
--- a/mercurial/wireprotoserver.py	Thu Feb 01 17:12:07 2018 -0800
+++ b/mercurial/wireprotoserver.py	Wed Feb 07 20:22:44 2018 -0800
@@ -192,7 +192,7 @@
                     break
 
             # Now find an agreed upon compression format.
-            for engine in wireproto.supportedcompengines(self._ui, self,
+            for engine in wireproto.supportedcompengines(self._ui,
                                                          util.SERVERROLE):
                 if engine.wireprotosupport().name in compformats:
                     opts = {}