diff --git a/tsdb/engine/bz1/bz1.go b/tsdb/engine/bz1/bz1.go
index 47fa51034d..5ab1483c73 100644
--- a/tsdb/engine/bz1/bz1.go
+++ b/tsdb/engine/bz1/bz1.go
@@ -598,7 +598,6 @@ func (tx *Tx) Cursor(key string) tsdb.Cursor {
 
 	c := &Cursor{
 		cursor: b.Cursor(),
-		buf:    make([]byte, DefaultBlockSize),
 	}
 
 	return tsdb.MultiCursor(walCursor, c)