A socket, for electrically connecting an IC package with gaps on two sides thereof and a printed circuit board, comprises an insulative housing, a plurality of contacts received in the insulative housing and a pair of engaging clumps. The insulative housing has a bottom wall and a plurality of sidewalls upwardly extending from the bottom wall, the sidewalls and the bottom wall together define a space for the IC package, two opposed sidewall further have engaging slots. The engaging clump is received in the engaging slot, and has a post entering into the space to engaging with the gap of the IC package and a transverse arm abutting against and position the IC package.