unused bb
diff --git a/src/libdiskfs/venti.c b/src/libdiskfs/venti.c
index 8b4d051..f0e8a84 100644
--- a/src/libdiskfs/venti.c
+++ b/src/libdiskfs/venti.c
@@ -81,7 +81,7 @@
 VtBlock*
 _vtfileblock(VtCache *c, VtEntry *e, u32int bn)
 {
-	VtBlock *b, *bb;
+	VtBlock *b;
 	int i, d, index[VtPointerDepth+1], t;
 	uchar score[VtScoreSize];