A corner brace configured to support a tile-bearing panel includes a pair of transverse brackets, disposed at a transverse angle to one another and being configured to be disposed in a corner between the tile-bearing panel and another panel or a support surface. At least one of the brackets has at least two ribs, each of which extends from an inner base to an enlarged outer head. The at least two ribs form at least one mortar receiving channel therebetween which has an enlarged chamber and a narrower opening with respect to the enlarged chamber. The mortar receiving channel is configured to at least partially interlock with mortar applied between the panel and the bracket to aid in securing the panel to the corner brace and thus to the other panel or support surface.