diff --git a/lib/py/src/protocol/TProtocolDecorator.py b/lib/py/src/protocol/TProtocolDecorator.py
index 3e9e500..bf50bfa 100644
--- a/lib/py/src/protocol/TProtocolDecorator.py
+++ b/lib/py/src/protocol/TProtocolDecorator.py
@@ -28,7 +28,7 @@
   def __getattr__(self, name):
     if hasattr(self.protocol, name):
       member = getattr(self.protocol, name)
-      if type(member) in [MethodType, UnboundMethodType, FunctionType, LambdaType, BuiltinFunctionType, BuiltinMethodType]:
+      if type(member) in [MethodType, FunctionType, LambdaType, BuiltinFunctionType, BuiltinMethodType]:
         return lambda *args, **kwargs: self._wrap(member, args, kwargs)
       else:
         return member