An electrical connector includes an insulative housing defining a plurality of passageways extending in a mating direction and a plurality of contacts secured in the passageways of the insulative housing. The insulative housing further defines a plurality of communicating slots extending downwardly and communicating with the passageways. Each passageway is wider than the communicating slot which is thereabove. Each contact defines a connecting portion receiving in the passageway and a contacting portion bending upwardly from the connecting portion and extending beyond the communicating slot. The connecting portion defines a pair of restricting portions respectively extending from two sides thereof in a direction perpendicular to the mating direction, the pair of restricting portions is prevented in the passageway from extending beyond the communicating slot.