If your overall outside tire circumference is within 1/16 of an inch, you are good to go. The problem is, this has to be the case for all four tires.
You can buy a tire from TireRack and have them shave the tread off to a specified amount, and this would be a cheaper option as opposed to buying four new tires (unless you need new ones anyway). Bear in mind that a patched tire will, in most cases, no longer meet its speed rating.
If I were you, this is what I would do. I think they only charge a small fee, and no doubt they will guide you on how to measure the tires properly so they can shave the proper amount.
Tires are pretty cheap in the grand scheme of things and not something *I* ever take chances with.