diff --git a/lib/py/src/transport/TTwisted.py b/lib/py/src/transport/TTwisted.py
index 2b77414..29bbd4c 100644
--- a/lib/py/src/transport/TTwisted.py
+++ b/lib/py/src/transport/TTwisted.py
@@ -42,7 +42,7 @@
     def flush(self):
         msg = self.__wbuf.getvalue()
         self.__wbuf = StringIO()
-        self.sendMessage(msg)
+        return self.sendMessage(msg)
 
     def sendMessage(self, message):
         raise NotImplementedError
@@ -55,7 +55,7 @@
         self.func = func
 
     def sendMessage(self, message):
-        self.func(message)
+        return self.func(message)
 
 
 class ThriftClientProtocol(basic.Int32StringReceiver):