Let A(1, n) denote the (1, n)-th Fourier coefficients of a SL(3, Z) Hecke eigenform. Let Q(x, y) be a symmetric positive definite quadratic form. In this paper, we shall prove that S := Sigma(m <= X) Sigma(n <= X) A(1, Q(m,n))W-1 (m/X) W-2 (n/X) << X2-1/68+epsilon, for any positive epsilon > 0, where W-1 and W-2 are smooth bump functions supported on the interval [1, 2]. (c) 2023 Elsevier Inc. All rights reserved.