You might want to double-check your ticket if you’re heading to Ann Arbor for the Oct. 7 meeting between in-state rivals Michigan State and Michigan.

According to a press release from Michigan’s ticket office, there have already been instances of counterfeit tickets being sold for the game. Here’s the official statement from the release:

The Athletic Ticket Office has already seen instances of counterfeit tickets for the game. Fans presenting counterfeit tickets will not be admitted and with no inventory available for the game, the ticket office will not be able to assist fans that attempt to enter with invalid tickets.

The Michigan State-Michigan game has already sold out according to the ticket office. The game is scheduled to kickoff at 7:30 p.m. ET, which will be the first night game in the rivalry’s history.

The Wolverines defeated the Spartans 32-23 last season in East Lansing.