Abstract: A roller shutter intended to be used in an opening in a building, such as a shop front opening, having a series of laths joined to one another such that they can pivot, a roller with respect to which the series of laths can be rolled up to expose the opening and can be rolled down to close the opening. The roller shutter also has guide rails that are located at the ends of the laths, in which guide rails the ends of the laths are accommodated such that they can move for guiding the laths over the opening. The end of each lath and the associated guide rails have anchors for anchoring the end of the lath against sideways movement out of said associated guide rails.