A device for verifying a machine-readable security feature of a document of value, having: a transport device configured to transport the document on a transport plane, a radiation emitter that is arranged on a first flat side and emits radiation in the direction towards the first flat side, a sensor that is arranged on the first flat side and is configured to receive at least part of the luminescent radiation, a reflector arranged and configured on the second flat side-so as to at least partly reflect the luminescent radiation of the security feature of the document of value to the sensor, and an evaluation unit.