In 1871 the fort got an extra barracks. The barracks were made from large sandstone blocks and carved out of the rock on the headland. This addition was the work of James Barnet, a colonial architect. This most recent add-on had three gun pits and had connecting walkways for the people in the army that worked there. The upgrade of 1871 was complementary to some of the larger fortifications being constructed during the same period.