The Chicks have postponed their Los Angeles concert because of illness, announcing the change hours before doors were due to open at the Dolby Theatre. The show, originally scheduled for Monday, Nov. 2, will now take place Wednesday, Nov. 4.

In a statement shared by the group, The Chicks said previously purchased tickets would be valid for the new date. Fans who cannot attend can request a refund from their original point of purchase.

The postponed performance is part of the trio’s Taking the Long Way 20th anniversary tour, which is nearing its end. The run celebrates the album, released in 2006, which debuted at No. 1 on the Billboard 200 and earned five Grammy Awards, including album of the year.

“Not Ready to Make Nice,” one of the album’s signature tracks, reached No. 4 on the Billboard Hot 100 and won the Grammys for both record of the year and song of the year. The song addressed the backlash that followed Natalie Maines’ 2003 criticism of President George W. Bush and the Iraq War during a concert in London.

The anniversary tour features Maines, Martie Maguire and Emily Strayer performing songs from Taking the Long Way alongside material from across the group’s catalog. The Chicks also marked the album’s anniversary with a 20th anniversary edition.

Sources: Billboard.