diff --git a/libavcodec/tiff.c b/libavcodec/tiff.c
index dc24d055ec..d93a02b07e 100644
--- a/libavcodec/tiff.c
+++ b/libavcodec/tiff.c
@@ -859,8 +859,11 @@ static void dng_blit(TiffContext *s, uint8_t *dst, int dst_stride,
             }
         } else {
             for (line = 0; line < height; line++) {
+                uint8_t *dst_u8 = dst;
+                const uint8_t *src_u8 = src;
+
                 for (col = 0; col < width; col++)
-                    *dst++ = dng_process_color8(*src++, s->dng_lut, s->black_level, scale_factor);
+                    *dst_u8++ = dng_process_color8(*src_u8++, s->dng_lut, s->black_level, scale_factor);
 
                 dst += dst_stride;
                 src += src_stride;