An electrical connector (1) includes an insulating housing (2), a plurality of contacts (4) received in a plurality of passageways (24) defined in the housing, a metal shell (3) and a spacer (5). The housing has a pair of protrusions (26) projecting downwardly on a lower wall (22) thereof. The shell encloses the insulating housing and comprises an upper and a lower body portions (30, 31). The lower body portion defines a pair of receiving apertures (310), which each receive a corresponding protrusion of the housing therein. The spacer has a base plate (50) defining a plurality of through holes (500) to allow extension of the contacts therethrough. The spacer is assembled to the housing and presses the lower body portion of the shell against the lower wall of the housing.