In a method for operating a longitudinally guiding driver assist system of a motor vehicle, wherein a comfort curve speed is determined as a function of curve data, wherein the curve data are commensurate with at least one curve to be driven through next by the motor vehicle, wherein a target speed is determined as a function of the curve comfort speed at a defined point of the curve, and wherein the speed of the motor vehicle is adjusted as a function of at least the target speed of the motor vehicle.