Willie Nelson was forced to cancel three performances because of an undisclosed illness.

(Photo: Larry Busacca/Getty Images for NARAS)

The 83-year-old country crooner has postponed his three-night stint that was scheduled for this Monday, Tuesday and Wednesday at Buck Owens Crystal Palace in Bakersfield, Calif., his publicist Elaine Schock told the Associated Press Monday.

Though Schock did not say what was wrong with Nelson, she said he will be back on tour for a concert in San Antonio on Feb. 16. (RELATED: See Willie Nelson’s Touching Tribute To Merle Haggard)