diff --git a/grub-core/fs/ntfs.c b/grub-core/fs/ntfs.c
index 960833a34..b3117bf92 100644
--- a/grub-core/fs/ntfs.c
+++ b/grub-core/fs/ntfs.c
@@ -387,7 +387,7 @@ find_attr (struct grub_ntfs_attr *at, grub_uint8_t attr)
     }
   at->attr_cur = at->attr_nxt;
   mft_end = at->mft->buf + (at->mft->data->mft_size << GRUB_NTFS_BLK_SHR);
-  while (at->attr_cur < mft_end && *at->attr_cur != 0xFF)
+  while (at->attr_cur >= at->mft->buf && at->attr_cur < mft_end && *at->attr_cur != 0xFF)
     {
       at->attr_nxt = next_attribute (at->attr_cur, at->end);
       if (*at->attr_cur == GRUB_NTFS_AT_ATTRIBUTE_LIST)