Does the EF-S 15-85 creep?

I'm considering buying the EF-S 15-85 and would like to know if it creeps, i.e. extends when held upside-down. I plan to buy it as a walk around lens and creep would drive me nuts.

Obviously I could just go to a store and test it, but I have a feeling that this is the type of things that develops as the lens "loosens up"

Thanks in advance.