A foldable cornerlock is used in a frame assembly. The frame assembly includes first and second ends. The walls of the frame member define an interior of the frame member and also define at least one notch. The frame member is bendable at the notch to form a corner of the frame member. The foldable cornerlock is disposed in the notch and extends into the interior of the frame member. The foldable cornerlock comprises first and second body portions each configured to mate with the interior of the frame member. The body portions are movable relative to each other for inserting the foldable cornerlock into the notch of the frame member. The foldable cornerlock also comprises a hinge portion coupling the body portions together. The hinge portion defines an axis extending in a longitudinal direction through the hinge portion.