An electrical connector comprises an insulative housing having a base portion with a rear room depressed thereof, a top and a lower tongue portions extending forwardly, a plurality of contacts retained to the insulative housing, a spacer received in the rear room, and a metal shell having two side walls covering two sides of the insulative housing. The spacer has a base, a front portion and a rear portion extending upwardly from the base, and a groove depressed between the front and the rear portion. A metal plate received in the groove. The metal plate has a pair of cantilever arms extending downwardly from two side edges of the main portion. The pair cantilever arms are mirror and coplanar to each other, each of the cantilever arm having a protruding portion protruding beyond a side of the insulative housing to abut against the side wall of the metal shell.