1 files changed, 1 insertions, 1 deletions
diff --git a/block/mirror.c b/block/mirror.c
index 307bcf101e..7884b3bc78 100644
--- a/block/mirror.c
+++ b/block/mirror.c
@@ -245,7 +245,7 @@ static void coroutine_fn mirror_run(void *opaque)
         trace_mirror_before_sleep(s, cnt, s->synced);
         if (!s->synced) {
             /* Publish progress */
-            s->common.offset = end * BDRV_SECTOR_SIZE - cnt * BLOCK_SIZE;
+            s->common.offset = (end - cnt) * BDRV_SECTOR_SIZE;
 
             if (s->common.speed) {
                 delay_ns = ratelimit_calculate_delay(&s->limit, BDRV_SECTORS_PER_DIRTY_CHUNK);