diff --git a/vcsserver/hooks.py b/vcsserver/hooks.py
--- a/vcsserver/hooks.py
+++ b/vcsserver/hooks.py
@@ -69,7 +69,7 @@ class HooksDummyClient(object):
 
 class RemoteMessageWriter(object):
     """Writer base class."""
-    def write(message):
+    def write(self, message):
         raise NotImplementedError()