Abstract: A doorjamb strike plate reinforcing device to provide increased holding strength and, therefore, security to bolted doors and similar closures. A reinforcing device is provided having a rigid body configured for cooperating with a strike plate to laterally restrain a bolt received by the strike plate. Integral to the body of the device is fastening means for fastening a fastener thereto to secure the device to the doorjamb. The fastening means is configured for receiving a fastener from a direction above the device and for guiding the passage of the fastener into the doorjamb in a direction which is at an angle of less than 25 degrees to the plane defined by the strike plate and, preferably not greater than 10 degrees so as to provide for the anchoring of the device and strike plate in a direction which is substantially parallel to the line of force which would be exerted thereon during an attempt to forcefully open a bolted door.