Let G be a connected graph of order n having ε(G) end-vertices. Given a positive integer t, we denote by S(G, t) the t-th generalized Sierpiński graph of G. In this note we show that if every internal vertex of G is a cut vertex, then the strong metric dimension of S(G, t) is given by dim s (S(G, t)) = ε(G) n t − 2n t−1 + 1 − n + 1 n − 1 .