1 files changed, 3 insertions, 3 deletions

diff --git a/src/mailman/rules/max_size.py b/src/mailman/rules/max_size.py
index 420d63571..a67d87771 100644
--- a/src/mailman/rules/max_size.py
+++ b/src/mailman/rules/max_size.py
@@ -17,7 +17,7 @@
 
 """The maximum message size rule."""
 
-from __future__ import absolute_import, unicode_literals
+from __future__ import absolute_import, print_function, unicode_literals
 
 __metaclass__ = type
 __all__ = [
@@ -25,16 +25,16 @@ __all__ = [
     ]
 
 
-from zope.interface import implements
+from zope.interface import implementer
 
 from mailman.core.i18n import _
 from mailman.interfaces.rules import IRule
 
 
 
+@implementer(IRule)
 class MaximumSize:
     """The implicit destination rule."""
-    implements(IRule)
 
     name = 'max-size'
     description = _('Catch messages that are bigger than a specified maximum.')