An electrical connector electrically connecting a chip module to a printed circuit board includes an insulative housing that a number of contacting terminals and a number of grounding terminals received therein, the insulative housing includes a mating surface and a mounting surface opposite to the mating surface, the grounding terminal is adjacent to the contacting terminal, and wherein the insulative housing also comprises a plurality of retention slots depressed from the matching surface thereof for fixing a retention portion of the grounding terminals, the retention slot has a sidewall that plated with a metal layer, the retention portion comprises a tongue and elastic contacted with the metal layer.