A card edge connector 100 includes an elongated insulative housing 1, a plurality of contacts 2 retained in the housing 1 and a pair of latches 3 pivoted on the housing 1. The housing 1 has an elongated central slot 12 for receiving a daughter card 200. The latch 3 has a locking head 36 to lock the daughter card 200 for preventing the daughter card 200 from escaping out of the central slot 12 in a mating direction. An end of the locking head 36 has a bump 360 passing through the daughter card 200 to abut against an outside surface of the daughter card 200.