newbie question on tokenizer and unicode text

Hi all, I'm a newcomer to boost and am rewriting one of my text characterization programs to use some boost libraries. I'm running into a problem with non ascii text. I'm using MSVC 7.0 to compile my program and the project is setup to link to the unicode CRT. The problem is when boost::char_delimiters_separator<>::is_nonret is calling MSVC's CRT std::isspace() which takes an int; and isspace() is (of course) choking on a '©' (for example) in my training data. Is there something obvious I'm missing? Thanks in advance. -Eric Lucas