Modular plug for terminating a cable having twisted signal pairs of wires including a plug housing having contact blade-receiving slots at a front end and defining a longitudinally extending cavity opening at a rear end and a strain relief member defining a channel for receiving the cable. A wire aligner is interposed between the strain relief member and the housing and arranged at least partially in the cavity. The wire aligner aligns the wires of the cable into specific position relative to the slots and crimps the cable when received in the channel of the strain relief member. To crimp the cable, the wire aligner is formed with retention fingers which exert an inwardly directed force against the cable when receive din the channel of the strain relief member.