Anchorage for a roof such as a flat or preferably sloping roof. The anchorage consists of an anchoring point such as an eye. According to the invention, said anchoring point can be moved back and forth in a direction essentially perpendicular to the roof from a position in which it is fitted essentially flush with the roof to a position in which it is projecting from the roof. For this purpose, there is a roof passage for the anchoring point, which roof passage part can be closed off with a cap that is preferably provided on the anchoring point. The anchoring point is accommodated so that it can be moved axially in a bush mat is fixed by means of a plate construction on the outside of the roof. A corresponding plate construction is fixed on the inside of the roof, so that the roof becomes clamped between two plates. The axial movement is preferably achieved by screwing, so that it is possible to move the anchoring point outside by operation from the inside.