Willie Nelson was forced to cut short his concert in Salt Lake City last night (Aug. 13) due to respiratory issues caused by elevation.

The 84-year-old county music icon was performing at USANA Amphitheatre, which has an elevation of 4,300 feet, when he began to experience breathing problems and exited the stage. A bandmate told the crowd that Willie needed a break, before the show was ultimately canceled.

Willie posted a message on Twitter this monring (Aug. 14) to let everyone know he was feeling better, stating, “This is Willie, I am sorry to have to cut the SLC show short tonight. The altitude got to me. I am feeling better now & headed for lower ground.

This is Willie I am sorry to have to cut the SLC show short tonight The altitude got to me I am feeling better now & headed for lower ground

— Willie Nelson (@WillieNelson) August 14, 2017

Willie was forced to cancel a handful of shows in January and February due to an undisclosed illness, but has been touring steadily since then. Willie is slated to perform in Saratoga, Calif., on Aug. 15.