diff --git a/qemu-img.c b/qemu-img.c
index 1dcdd47254..e1a506f7f6 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2906,7 +2906,7 @@ static int img_map(int argc, char **argv)
         int64_t n;
 
         /* Probe up to 1 GiB at a time.  */
-        n = QEMU_ALIGN_DOWN(MIN(1 << 30, length - offset), BDRV_SECTOR_SIZE);
+        n = MIN(1 << 30, length - offset);
         ret = get_block_status(bs, offset, n, &next);
 
         if (ret < 0) {