fuzzyfinder.vim and rubygems 1.3.1 are not compatible

[oreng]

I get this error when running vim with fuzzyfinder.vim and fuzzyfinder_textmate.vim:

Error detected while processing function InstantiateTextMateMode:
line   17: LoadError: /usr/local/lib/site_ruby/1.8/rubygems/custom_require.rb:31:in `gem_original_require': no such file to load -- fuzzy_file_finder

(with rubygems 1.3.0 everything works fine)

any idea how to solve this?
Thanks!