iTunes doesn't mark missing song files with "!"

[RiseDarthVader]

I've got 4 missing song files in my iTunes library but the problem is if I go through every album or I view my iTunes library in song view it doesn't mark the missing files with a "!" mark like it should. this is very annoying as I'm not wanting to through every song one by one in my 100+ album collection to try and trigger iTunes to locate the missing file. Any way to get the missing files marked with "!" like they should?