--- a/pvl/hosts/interface.py	Mon Mar 09 23:31:13 2015 +0200
+++ b/pvl/hosts/interface.py	Tue Mar 10 00:11:43 2015 +0200
@@ -16,8 +16,8 @@
     def __str__(self):
         return self.name
     
-@pvl.hosts.extension
-class HostInterfaces(object):
+@pvl.hosts.host.register_extension
+class HostInterfaces(pvl.hosts.host.HostExtension):
     """
         A host with multiple sub-interfaces.