Registered In Two States?

I just realized it's possible I'm registered to vote in two states. I've lived in Illinois for over 25 years and I've been registered to vote here the whole time. Before that I was registered in Oregon and even after moving out-of-state, it never occurred to me to proactively cancel my voter registration. It's possible there's some kind of inactivity clause, where you get deleted if you don't vote for some number of years, but if not, then yup. I'm double registered.