Let X, X 1 , X 2 , . . . be a sequence of non-lattice i.i.d. random variables with E X = 0, E X = 1, and let S n := X 1 + · · · + X n , n 1. We refine Stone's integro-local theorem by deriving the first term in the asymptotic expansion for the probability P S n ∈ [x, x + ∆) as n → ∞ and establishing uniform bounds for the remainder term, under the assumption that the distribution of X satisfies Cramér's strong non-lattice condition and E |X| r < ∞ for some r 3.