A masonry guide 1 for use in laying brick walls to obtain a straight bond between the successive brick courses. The masonry guide 1 comprises at least a tubular guide member 2 having an extension piece 3 of smaller cross section made of durable undeformable material, which tubular guide member 2 comprises means for fitting bracing means 8 with respect to the bearing face of the guide member 1, and which extension piece 3, qua cross section, is suitable for a tight, slidable fit in a similar guide member 6 as attachment to the masonry guide 1. In a preferred embodiment, the above means is formed by at least one hole or recess 7 in the tubular wall of the masonry guide 1 in combination with the insertion of nailable material inside the masonry guide 1 at the location of such a recess 7.