A locking mechanism for a casement window assembly includes a housing adapted to be mounted on the window assembly, an actuator operably connected to the housing and pivotable about a fulcrum, and a linkage member having a first channel and a second channel. The housing has an elongated opening having opposed ends. The actuator includes an actuator body having a first pin and a second pin located thereon. The linkage member is connected to the actuator such that the first pin is received in the first channel and the second pin is received in the second channel. Pivoting the actuator about the fulcrum causes the first pin to move within the first channel and the second pin to move within the second channel, moving the linkage member along the opening, from one end of the opening to the other end of the opening.