diff --git a/kernel/fs.c b/kernel/fs.c
index 3a74c1f..454d52b 100644
--- a/kernel/fs.c
+++ b/kernel/fs.c
@@ -93,7 +93,6 @@ bfree(int dev, uint b)
   struct buf *bp;
   int bi, m;
 
-  readsb(dev, &sb);
   bp = bread(dev, BBLOCK(b, sb));
   bi = b % BPB;
   m = 1 << (bi % 8);