Rascal Flatts are going to have some disappointed fans in Oklahoma.

The band have canceled their concert scheduled for the OKC Center in Oklahoma City Thursday night (July 10), after lead singer Gary LeVox fell ill. They took to social media Wednesday night to break the bad news directly to their fans.

The hit-making vocal harmony trio have been on the road promoting their ninth studio album, 'Rewind,' with special guests Sheryl Crow and Gloriana.

No makeup date has been announced for the Oklahoma City show. Fans who used their credit card to purchase tickets will have their money refunded within seven business days. Those who purchased through any other means can contact Stubwire at 877-960-7882.

No further cancellations have been announced. As it stands, upcoming shows in Austin and Dallas are still scheduled to take place.

Watch Rascal Flatts Perform 'Rewind' Acoustically