A window lock with a lock housing positioned on a first window sash and containing a cam rotatably connected to a handle protruding vertically from the housing and including two adjustable reinforcement members extending laterally from the rear surface of the lock housing is provided. The window lock also includes a lock keeper positioned on a second, adjacent window sash with a central slot sized and shaped to receive the cam therein and a pair of channels oriented in longitudinally opposing orientation relative to the central slot, each channel defining a “T” shape to receive each of the adjustable reinforcement members therein.