diff --git a/lib/_stream_writable.js b/lib/_stream_writable.js
index 257a400fa5e..f02eb4edc1e 100644
--- a/lib/_stream_writable.js
+++ b/lib/_stream_writable.js
@@ -27,7 +27,6 @@ module.exports = Writable;
 Writable.WritableState = WritableState;
 
 var util = require('util');
-var assert = require('assert');
 var Stream = require('stream');
 
 util.inherits(Writable, Stream);