Janet Jackson has been forced to call off her Las Vegas tour dates because of problems with her voice.

The US music star is cancelling her October 9 and 10 shows at Planet Hollywood Resort and Casino to rest her vocal cords, and the Vegas stop on her Unbreakable tour will now move to a new 20,000-seat arena in May 2016.

Live Nation Entertainment said that ticketholders will be refunded and have the first chance to buy tickets for the May 14 performance. Tickets go on sale on October 16.

Janet Jackson
(Chris Pizzello/AP)

The move is a loss for Caesars Entertainment Corp, which owns the venue at Planet Hollywood that features regular performances by Britney Spears and soon Jennifer Lopez.

MGM Resorts International is working with concert presenter AEG to open the new arena behind MGM’s New York-New York and Monte Carlo resorts in April.

Jackson’s comeback album, Unbreakable, is out now.