diff --git a/lib/fs.js b/lib/fs.js
index 94c4a503f64..8be6cf85899 100644
--- a/lib/fs.js
+++ b/lib/fs.js
@@ -1559,7 +1559,6 @@ function WriteStream(path, options) {
 
   // a little bit bigger buffer and water marks by default
   options = util._extend({
-    bufferSize: 64 * 1024,
     lowWaterMark: 16 * 1024,
     highWaterMark: 64 * 1024
   }, options || {});