--- a/cwvreg.py	Mon Mar 23 18:53:53 2009 +0100
+++ b/cwvreg.py	Wed Mar 25 10:40:22 2009 +0100
@@ -126,7 +126,7 @@
                 for cls in classes:
                     for iface in cls.__implements__:
                         interfaces.update(iface.__mro__)
-                    interfaces.update(expand_parent_classes(cls.__mro__))
+                    interfaces.update(cls.__mro__)
             for obj, ifaces in self._needs_iface.items():
                 ifaces = frozenset(isinstance(iface, basestring)
                                    and iface in self.schema