merge method fails on Python 3

Could you please aply this merge or correct this problem, i'm having the following error on Python 3.3

File "XXXXXX/lib/python3.3/site-packages/Babel-1.3-py3.3.egg/babel/support.py", line 590, in merge
    self.files.extend(translations.files)
AttributeError: 'filter' object has no attribute 'extend'

Thanks!