diff --git a/bin/nova-novncproxy b/bin/nova-novncproxy
index c4eb7a8be..3abaaa769 100755
--- a/bin/nova-novncproxy
+++ b/bin/nova-novncproxy
@@ -73,6 +73,7 @@ LOG = logging.getLogger(__name__)
 class NovaWebSocketProxy(websockify.WebSocketProxy):
     def __init__(self, *args, **kwargs):
         websockify.WebSocketProxy.__init__(self, unix_target=None,
+                                           target_cfg=None,
                                            ssl_target=None, *args, **kwargs)
 
     def new_client(self):