diff --git a/lib/inflate.js b/lib/inflate.js
index a081ea8..c3221ba 100644
--- a/lib/inflate.js
+++ b/lib/inflate.js
@@ -11,9 +11,9 @@ var gzheader = require('./zlib/gzheader');
 
 
 // calculate tail size of utf8 char by current byte value
-function utf8tail(code) {
+/*function utf8tail(code) {
   return code >= 252 ? 6 : code >= 248 ? 5 : code >= 240 ? 4 : code >= 224 ? 3 : code >= 192 ? 2 : 1;
-}
+}*/
 
 /**
  * class Inflate
@@ -180,7 +180,7 @@ Inflate.prototype.push = function(data, mode) {
   var strm = this.strm;
   var chunkSize = this.options.chunkSize;
   var status, _mode;
-  var next_out_utf8_index, tail, utf8str;
+  //var next_out_utf8_index, tail, utf8str;
 
   if (this.ended) { return false; }
   _mode = (mode === ~~mode) ? mode : ((mode === true) ? c.Z_FINISH : c.Z_NO_FLUSH);