1 files changed, 3 insertions, 4 deletions

diff --git a/src/mailman/archiving/prototype.py b/src/mailman/archiving/prototype.py
index 453c6c770..3ce51ddb5 100644
--- a/src/mailman/archiving/prototype.py
+++ b/src/mailman/archiving/prototype.py
@@ -17,7 +17,7 @@
 
 """Prototypical permalinking archiver."""
 
-from __future__ import absolute_import, unicode_literals
+from __future__ import absolute_import, print_function, unicode_literals
 
 __metaclass__ = type
 __all__ = [
@@ -34,7 +34,7 @@ from mailbox import Maildir
 from urlparse import urljoin
 
 from flufl.lock import Lock, TimeOutError
-from zope.interface import implements
+from zope.interface import implementer
 
 from mailman.config import config
 from mailman.interfaces.archiver import IArchiver
@@ -43,6 +43,7 @@ log = logging.getLogger('mailman.error')
 
 
 
+@implementer(IArchiver)
 class Prototype:
     """A prototype of a third party archiver.
 
@@ -50,8 +51,6 @@ class Prototype:
     servers and archivers: <http://wiki.list.org/display/DEV/Stable+URLs>.
     """
 
-    implements(IArchiver)
-
     name = 'prototype'
 
     @staticmethod