diff --git a/av1/encoder/encoder.c b/av1/encoder/encoder.c
index 2acd97a..e2d6b3d 100644
--- a/av1/encoder/encoder.c
+++ b/av1/encoder/encoder.c
@@ -2728,7 +2728,7 @@
 #if CONFIG_RD_COMMAND
       PSNR_STATS psnr;
       aom_calc_psnr(cpi->source, &cpi->common.cur_frame->buf, &psnr);
-      printf("q %d rdmult %d rate %d dist %lu\n", q, cpi->rd.RDMULT,
+      printf("q %d rdmult %d rate %d dist %" PRIu64 "\n", q, cpi->rd.RDMULT,
              rc->projected_frame_size, psnr.sse[0]);
       ++rd_command->frame_index;
       if (rd_command->frame_index == rd_command->frame_count) {