An electrical connector includes a number of contacts and an insulative housing. Each contact includes a main body, a spring portion extending upwardly from the main body, and a tail portion defining a receiving space in a vertical plane. The insulative housing has a plurality of passageways retaining the contacts. An inner sidewall of each passageway has a protrusion extending into the receiving space to limit a movement of the contact, such that the contact can float upwardly and downwardly in the vertical direction without being drawn out of the passageway.