Fr d ric Klopp Erratum to the paper ``Internal Lifshits tails for random perturbations of periodic Schr dinger operators''\\ Duke Math. Jour. 98(2):335-396, 1999 (188K, gzipped Postscript) ABSTRACT. We correct a mistake in~\cite{MR1695202} and prove that in the case of long range single site perturbations, the density of states of a continuous Anderson model exhibits Lifshitz tails at all band edges, and that the Lifshitz exponent is determined by the decay rate of the single site perturbation.