A device for closing a plug connector housing which comprises a first housing part and a second housing part includes a locking element which comprises an elongate handle and two fastening portions which are each connected to the handle. The fastening portions each comprise a first web element and a second web element which are arranged with respect to one another in a V-shape. The web elements each comprise a free end portion for fastening to a bearing journal which is formed on the first housing part and the second housing part. A third web element having a curvature arranged between the first web element and the second web element such that the fastening portions each comprise a through-opening. The through-opening is delimited by the first web element, the second web element and the third web element.