Using import matlab.io.* with Compiler

Using fits.openFile, fits.readKey, fits.readImg, and so forth works fine in my code when I specify import matlab.io.*. However, I can't get this to work in the compiled version. Running 8.1.0.604 (R2013a) 32-bit. Help!

PS - using fitsread and fitsinfo, with no import, does work in the compiled version.