diff --git a/kombu/tests/mocks.py b/kombu/tests/mocks.py
index dfcff423..eca0ab45 100644
--- a/kombu/tests/mocks.py
+++ b/kombu/tests/mocks.py
@@ -17,7 +17,7 @@ class Message(base.Message):
         return super(Message, self).decode()
 
 
-class Channel(object):
+class Channel(base.StdChannel):
     open = True
     throw_decode_error = False
 
diff --git a/kombu/transport/memory.py b/kombu/transport/memory.py
index 7553a9fd..35907e35 100644
--- a/kombu/transport/memory.py
+++ b/kombu/transport/memory.py
@@ -41,6 +41,9 @@ class Channel(virtual.Channel):
         self.queues[queue].queue.clear()
         return size
 
+    def after_reply_message_received(self, queue):
+        pass
+
 
 class Transport(virtual.Transport):
     Channel = Channel