Let R be a prime ring and m, n be fixed non-negative integers such that m+n ≠ 0. Suppose L is an (m+m+1)-power closed Lie ideal, and this means ure+n+1 ∈ L for all u ∈ L. If charR = 0 or a prime p 〉 2(m + n), we characterize the additive maps d: L → R satisfying d(um+n+1) = (m -+n + 1)umd(u)un (resp., d(um+n+l) = umd(u)un) for all u ∈ L.