The paper deals with the problem of automatic speaker change detection. A metric-based algorithm, called MDISTBIC, which means Modified DISTBIC, is proposed in this paper. The algorithm originates from the DISTBIC algorithm and modifies it in order to reach a higher efficiency. Both the DISTBIC and the MDISTBIC methods are tested in a number of experiments. As the results show, the MDISTBIC algorithm is more efficient than the DISTBIC algorithm in a majority of tests.