diff --git a/vendor/constants.js b/vendor/constants.js
index f7103158e7d8..fe0912730ac1 100644
--- a/vendor/constants.js
+++ b/vendor/constants.js
@@ -15,7 +15,6 @@
  */
 'use strict';
 
-var assert = require('assert');
 var recast = require('recast');
 var types = recast.types;
 var namedTypes = types.namedTypes;