A control device for a controllable brake booster of a braking system is configured to: establish a setpoint variable regarding a setpoint operation to be carried out with the aid of the controllable brake booster, under consideration of a provided specified variable regarding a setpoint pressure to be set in a partial volume of the braking system; establish a setpoint difference of the setpoint variable, under consideration of the specified variable and an actual variable regarding an actual pressure present in a subarea of the braking system, to establish a corrected setpoint variable taking the established setpoint difference into consideration; and output a control signal which corresponds to the established corrected setpoint variable to the controllable brake booster and/or to the power supply component of the controllable brake booster.