A device for controlling a light emission of a rear light of a vehicle, the rear light comprising optical components having emitting surfaces with at least three partial emitting surfaces, and at least a first and a second light function being generated by the light emission of the emitting surfaces, the device comprising a control device via which the light emission by the partial emitting surfaces are controllable, the optical components being controlled by the control device such that after a switchover process from the first to the second light function, the first partial emitting surface, which emits light for the first light function, no longer emits light, the second partial emitting surface, which emits light for the first light function, continues to emit light, and the third partial emitting surface, which does not emit light for the first light function, emits light.