A reinforced door jamb and method thereof, to prevent breaking of a lock. A doorjamb is reinforced by inserting one or two reinforced plates into the door jamb. One plate is inserted close to the door latch receiving recess on the interior side of the door jamb, and the other plate is inserted close to the exterior side of the door jamb. The reinforced plates are then connected to each other using high strength rods or bolts.