diff --git a/libavcodec/jpeg2000dec.c b/libavcodec/jpeg2000dec.c
index 11f4cd6ff6c2bb468af9408adb335bb5391eb9c5..43568ea0ebf510020b56466d2f6367d70d62fb68 100644
--- a/libavcodec/jpeg2000dec.c
+++ b/libavcodec/jpeg2000dec.c
@@ -1457,7 +1457,7 @@ static void dequantization_int_97(int x, int y, Jpeg2000Cblk *cblk,
         int32_t *datap = &comp->i_data[(comp->coord[0][1] - comp->coord[0][0]) * (y + j) + x];
         int *src = t1->data[j];
         for (i = 0; i < w; ++i)
-            datap[i] = (src[i] * band->i_stepsize + (1<<14)) >> 15;
+            datap[i] = (src[i] * (int64_t)band->i_stepsize + (1<<14)) >> 15;
     }
 }