Electromechanical motor vehicle steering system having • a steering pinion which is connected to a lower steering shaft and is in engagement with a steering rack which is mounted so as to be displaceable along a longitudinal axis in a housing and has the purpose of steering wheels, • having an electric motor which has a rotor, has the purpose of providing steering assistance and drives the lower steering shaft by means of a transmission, • having a torque sensor which is arranged between an upper steering shaft, which is connected to the steering wheel, and the lower steering shaft, and senses a steering torque (T TS) which is applied by the driver and a reactive torque (T STR) which is applied to the upper steering shaft by the lower steering shaft, and • having a control device which comprises a steering controller and a motor regulating system of the electric motor, wherein the steering controller calculates a motor setpoint torque (T D) and passes it on to the motor regulating system, wherein the motor regulating system determines motor currents (i U1, i V1, i W1 = i 1) for operating the electric motor, where the control device has a compensation regulator which impresses a signal on the rotor of the electric motor as a function of the reactive torque (T STR) which is measured by the torque sensor, characterized in that the signal is embodied in such a way that a relative movement, arising as result of the reactive torque (T STR) in the transmission, between a drive side facing the electric motor and an output side facing the lower steering shaft, is compensated, and the signal causes a torque of the rotor, by means of which torque the drive side of the transmission operates with the load, with the result that the transmission avoids surges of the reactive torque (T STR). • a steering pinion which is connected to a lower steering shaft and is in engagement with a steering rack which is mounted so as to be displaceable along a longitudinal axis in a housing and has the purpose of steering wheels, • having an electric motor which has a rotor, has the purpose of providing steering assistance and drives the lower steering shaft by means of a transmission, • having a torque sensor which is arranged between an upper steering shaft, which is connected to the steering wheel, and the lower steering shaft, and senses a steering torque (T TS) which is applied by the driver and a reactive torque (T STR) which is applied to the upper steering shaft by the lower steering shaft, and • having a control device which comprises a steering controller and a motor regulating system of the electric motor, wherein the steering controller calculates a motor setpoint torque (T D) and passes it on to the motor regulating system, wherein the motor regulating system determines motor currents (i U1, i V1, i W1 = i 1) for operating the electric motor, where the control device has a compensation regulator which impresses a signal on the rotor of the electric motor as a function of the reactive torque (T STR) which is measured by the torque sensor, characterized in that the signal is embodied in such a way that a relative movement, arising as result of the reactive torque (T STR) in the transmission, between a drive side facing the electric motor and an output side facing the lower steering shaft, is compensated, and the signal causes a torque of the rotor, by means of which torque the drive side of the transmission operates with the load, with the result that the transmission avoids surges of the reactive torque (T STR).