diff --git a/gulp/build.js b/gulp/build.js
index 405cacc8..13915051 100644
--- a/gulp/build.js
+++ b/gulp/build.js
@@ -40,7 +40,7 @@ function replaceAll(string, find, replace) {
 function stringSrc(filename, string) {
   let src = require('stream').Readable({objectMode: true});
   src._read = function () {
-    this.push(new gutil.File({cwd: '', base: '', path: filename, contents: new Buffer(string)}));
+    this.push(new gutil.File({cwd: '', base: '', path: filename, contents: Buffer.from(string)}));
     this.push(null);
   };
   return src;