An arrangement for measuring the body temperature of a living organism includes a sensor housing containing a first temperature sensor for measuring the skin temperature of the living organism, a second temperature sensor and an evaluation unit. The first temperature sensor is placed on the skin of the body and the second temperature sensor is arranged thermally insulated on the side of the first temperature sensor facing away from the skin and is at a spacing relative to the first temperature sensor. The evaluation unit computes the body temperature in accordance with a pregiven temperature formula which contains a temperature difference from the temperatures measured by the first temperature sensor and the second temperature sensor. A compensation unit is provided in such a manner that a lost heat flow (qsa) is considered which occurs during the measurement operation.