diff --git a/index.js b/index.js
index b7e4a04..a44d87f 100644
--- a/index.js
+++ b/index.js
@@ -13,7 +13,6 @@ const RESPONSE_FLAG = 1 << 15
 const FLUSH_MASK = 1 << 15
 const NOT_FLUSH_MASK = ~FLUSH_MASK
 const QU_MASK = 1 << 15
-const NOT_QU_MASK = ~QU_MASK
 
 const name = exports.name = {}