"unmappable character for encoding UTF-8" compiling ISO-8859-1 files

I have a mixed-encoding source tree and I'm getting the warning above for some of my source files. I managed to sucessfully set the encoding for those files to ISO 8859-1 and, after invalidating IDEA's caches, they now display correctly in the editor; however, when I compile, I still get the error message. Production builds use ant and it's not an issue there, but it means I can't "make" in the IDE. Is there a way to get IDEA to compile these correctly, or failing that, drop the error down to a warning?

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