diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index fb5181b..978ae7a 100644
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -150,6 +150,7 @@
                     Error **errp)
 {
     bs->sg = bs->file->sg;
+    bs->bl = bs->file->bl;
     return 0;
 }