winpdb not working with python 3.3

I can't get rpdb2 to run with python 3.3, while that should be possible according to several sources.

$ rpdb2 -d myscript.py
A password should be set to secure debugger client-server communication.
Please type a password:x
Password has been set.
Traceback (most recent call last):
  File "/usr/local/bin/rpdb2", line 31, in <module>
    rpdb2.main()
  File "/usr/local/lib/python3.3/dist-packages/rpdb2.py", line 14470, in main
    StartServer(_rpdb2_args, fchdir, _rpdb2_pwd, fAllowUnencrypted, fAllowRemote, secret)
  File "/usr/local/lib/python3.3/dist-packages/rpdb2.py", line 14212, in StartServer
    g_module_main = -1
  File "/usr/local/lib/python3.3/dist-packages/rpdb2.py", line 14212, in StartServer
    g_module_main = -1
  File "/usr/local/lib/python3.3/dist-packages/rpdb2.py", line 7324, in trace_dispatch_init
    self.__set_signal_handler()
  File "/usr/local/lib/python3.3/dist-packages/rpdb2.py", line 7286, in __set_signal_handler
    handler = signal.getsignal(value)
  File "/usr/local/lib/python3.3/dist-packages/rpdb2.py", line 13682, in __getsignal
    handler = g_signal_handlers.get(signum, g_signal_getsignal(signum))
ValueError: signal number out of range

The version of rpdb2 is RPDB 2.4.8 - Tychod. I installed it by running pip-3.3 install winpdb.

Any clues?