An arrangement for a loader makes it possible to attach a tool to the loader. The arrangement comprises a locking arrangement for determining the position of the tool and locking it to the arrangement in this position, and a safety arrangement that ensures that the locking arrangement takes up its locking position only when a tool is correctly arranged at the attachment arrangement. The arrangement includes a part that functions independently of the locking arrangement and that can retain the locking arrangement in an open position that does not perform the locking function, and a releasing part that releases the locking arrangement from the retaining part.