The invention relates to a blocking element (1) for a locking clip (2) of a plug-in connection. The plug-in connection consists of an electrical connector (3) and a mating electrical connector (4). In the prior art, the plug-in connection is fastened only by means of the locking clip (2), and therefore a "flying plug-in connection" exists, which is not protected from external influences. The blocking element (1) serves to fasten the locking clip (2) in the locked position (V).