diff -up londonlaw-0.2.1/londonlaw/server/Game.py~ londonlaw-0.2.1/londonlaw/server/Game.py
--- londonlaw-0.2.1/londonlaw/server/Game.py~	2007-09-23 10:34:43.000000000 +0200
+++ londonlaw-0.2.1/londonlaw/server/Game.py	2007-09-23 10:34:43.000000000 +0200
@@ -20,6 +20,7 @@ import sets
 
 from twisted.python import components
 from twisted.python import log
+from zope import interface
 
 from londonlaw.common.protocol import *
 from londonlaw.common.map import *
@@ -32,7 +33,7 @@ class GameError(Exception):
    pass
 
 
-class IGameListener(components.Interface):
+class IGameListener(interface.Interface):
    def announceHistory(self, history):
       pass