An electrical connector (100) includes an insulative housing (1), a number of contacts (2) retained in the insulative housing (1), and a metal shell (3) covering the insulative housing (1). The insulative housing (1) has a base (11) and a tongue (12) extending forwardly from the base (11). The metal shell (3) has a top wall (31), a bottom walls (32), and a pair of side walls (33). The top wall (31), bottom wall (32) and side walls (33) define a receiving space (34) therebetween. The bottom wall (32) has two first walls (321) extending opposed to each other from a lower end of the side walls (33), two oblique second walls (322) extending inwardly and upwardly from two first walls (321), and a third wall (323) connecting two second walls (322) together. The third wall (323) is higher than the second walls (322) along an up to down direction.