Abstract: A method for operating a roll straightening machine having a number of forming tools, the forming tools including at least one set of upper and lower straightening rollers, a flat metal material to be straightened being conveyed between the upper and lower straightening rollers in a conveying direction. In order to achieve high straightening quality even as wear occurs, the method includes the following steps: a) determining the wear state of at least one of the forming tools; b) determining a correction value and/or a compensation value for the operation of the forming tool on the basis of the determined wear state of said forming tool; c) adapting an operating parameter, in particular an adjustment parameter or setting value, for the forming tool on the basis of the determined correction value and/or compensation value.