A telescopic boom for a crane has at least two telescopable telescoping sections in the form of lattice pieces, each of which exhibits a hollow structure that has in essence the shape of a box. The bottom chords of adjacent sections have in each instance a pinning structure to provide for pinning to each other during normal crane operations. By way of the design of at least the outer telescoping section, at least some of the force that is introduced into the pinned joint can be dissipated into the top chord of the boom.