Call of Duty is apparently returning to the familiar battleground of World War II in 2017, according to a leak.

The move comes after a disappointing outcome for the science fiction version of the game, Call of Duty: Infinite Warfare, which pushed boundaries but didn’t sell as well as previous versions of the annual series.

The leak was first reported in a video on TheFamilyVideoGamers, a YouTube channel that said the details were emailed by an anonymous source.

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Activision has said that the game is returning to its traditional roots. But beyond that, the publisher hasn’t revealed anything. This year, Sledgehammer Games, the developer of Call of Duty: Advanced Warfare, is up for creating the next installment of Call of Duty. That means Sledgehammer will be the studio making the game for this fall.

Activision has three studios — including Treyarch and Infinity Ward — that rotate the duty of shipping a Call of Duty game each year. Each studio is independent and can run a different theme, like science fiction or historical, if it decides to do so.

We’ve asked Activision for a comment and will update once we know more.