diff --git a/bolt.go b/bolt.go
index ee18c79..5a0543d 100755
--- a/bolt.go
+++ b/bolt.go
@@ -60,6 +60,9 @@ func (b *Bolt) Set(key string, value []byte, ns ...string) error {
 		if err != nil {
 			return err
 		}
+		if value == nil {
+			return bkt.Delete(key)
+		}
 		return bkt.Put([]byte(key), value)
 	})
 }