diff --git a/lib/py/src/transport/TTwisted.py b/lib/py/src/transport/TTwisted.py
index 5710b57..a27f0ad 100644
--- a/lib/py/src/transport/TTwisted.py
+++ b/lib/py/src/transport/TTwisted.py
@@ -20,7 +20,7 @@
 from io import BytesIO
 import struct
 
-from zope.interface import implements, Interface, Attribute
+from zope.interface import implementer, Interface, Attribute
 from twisted.internet.protocol import ServerFactory, ClientFactory, \
     connectionDone
 from twisted.internet import defer
@@ -257,10 +257,9 @@
     oprot_factory = Attribute("Output protocol factory")
 
 
+@implementer(IThriftServerFactory)
 class ThriftServerFactory(ServerFactory):
 
-    implements(IThriftServerFactory)
-
     protocol = ThriftServerProtocol
 
     def __init__(self, processor, iprot_factory, oprot_factory=None):
@@ -272,10 +271,9 @@
             self.oprot_factory = oprot_factory
 
 
+@implementer(IThriftClientFactory)
 class ThriftClientFactory(ClientFactory):
 
-    implements(IThriftClientFactory)
-
     protocol = ThriftClientProtocol
 
     def __init__(self, client_class, iprot_factory, oprot_factory=None):