A building element for a toy building set comprising a plurality of such building elements, said building elements comprising a box-shaped body part having a surface with a top side and an underside, and a plurality of side faces extending downwards from the underside of the surface, a plurality of coupling flanges being arranged between the side faces, said coupling flanges extending downwards from the surface at a distance which is smaller than the distance at which the side faces extend from the surface, a plurality of coupling studs being arranged on the top side of the surface, each of said coupling studs having a top face positioned at a height above the top side of the surface which is greater than the difference between the distance at which the coupling flanges and the side faces extend from the surface, said coupling studs, coupling flanges and side faces being shaped such that the coupling studs of a building element engage, face-to-face, both the coupling flanges and the side faces of another building element after interconnection of these, a plurality of engagement means being arranged between the coupling flanges and the side faces, said engagement means being shaped and positioned in such a manner that they form an engagement face which engages the top face of the coupling studs upon interconnection of two building elements.