1 files changed, 1 insertions, 1 deletions
diff --git a/bio.c b/bio.c
index a61ff72..a45ff3e 100644
--- a/bio.c
+++ b/bio.c
@@ -99,7 +99,7 @@ bread(uint dev, uint blockno)
   struct buf *b;
 
   b = bget(dev, blockno);
-  if(!(b->flags & B_VALID)) {
+  if((b->flags & B_VALID) == 0) {
     iderw(b);
   }
   return b;