diff --git a/block/vvfat.c b/block/vvfat.c
index 4d44636..fc948cb 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -1210,7 +1210,7 @@
 
 static void vvfat_refresh_limits(BlockDriverState *bs, Error **errp)
 {
-    bs->request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O supported */
+    bs->bl.request_alignment = BDRV_SECTOR_SIZE; /* No sub-sector I/O */
 }
 
 static inline void vvfat_close_current_file(BDRVVVFATState *s)