diff --git a/lib/py/src/transport/TTransport.py b/lib/py/src/transport/TTransport.py
index 32553bd..9858bbe 100644
--- a/lib/py/src/transport/TTransport.py
+++ b/lib/py/src/transport/TTransport.py
@@ -298,7 +298,7 @@
     # ask for a refill until the previous buffer is empty.  Therefore,
     # we can start reading new frames immediately.
     while len(prefix) < reqlen:
-      readFrame()
+      self.readFrame()
       prefix += self.__rbuf.getvalue()
     self.__rbuf = StringIO(prefix)
     return self.__rbuf