diff --git a/libavcodec/dstdec.c b/libavcodec/dstdec.c
index c548174331..b70e0d27ec 100644
--- a/libavcodec/dstdec.c
+++ b/libavcodec/dstdec.c
@@ -155,7 +155,7 @@ static int read_table(GetBitContext *gb, Table *t, const int8_t code_pred_coeff[
             for (j = method + 1; j < t->length[i]; j++) {
                 int c, x = 0;
                 for (k = 0; k < method + 1; k++)
-                    x += code_pred_coeff[method][k] * t->coeff[i][j - k - 1];
+                    x += code_pred_coeff[method][k] * (unsigned)t->coeff[i][j - k - 1];
                 c = get_sr_golomb_dst(gb, lsb_size);
                 if (x >= 0)
                     c -= (x + 4) / 8;