An electrical connector (1) includes an insulative housing (2) having upper and lower surfaces, with a plurality of passageways (not label) extending therebetween, the insulative housing (2) further including longitudinal ends each form a block (212) with an end surface thereof; a plurality of contacts (3) assembled to the passageways, each including a contact engaging portion (not label) extending above the upper surface; metal shell (4) attached to the housing (2) and defining a receiving space with the upper surface of the housing (2), the metal shell (4) including an end tab (not label) corresponding to end surface of the block (212). The block (212) comprises a vertical stopper (2120) and a horizontal stopper (2121) extending from the underside of the vertical stopper (2120). While assembling the metal shell (4) to the insulative housing (2), the vertical stopper (2120) fastens the metal shell (4) in the horizontal direction, and the horizontal stopper (2121) fastens the metal shell (4) in the vertical direction, thereby the insulative housing (2) fastens with the metal shell (4) stably.