diff --git a/test/py.twisted/test_suite.py b/test/py.twisted/test_suite.py
index 43149a4..886de44 100755
--- a/test/py.twisted/test_suite.py
+++ b/test/py.twisted/test_suite.py
@@ -36,12 +36,11 @@
 from twisted.internet import defer, reactor
 from twisted.internet.protocol import ClientCreator
 
-from zope.interface import implements
+from zope.interface import implementer
 
 
+@implementer(ThriftTest.Iface)
 class TestHandler:
-    implements(ThriftTest.Iface)
-
     def __init__(self):
         self.onewaysQueue = defer.DeferredQueue()