diff --git a/lib/wallet/masterkey.js b/lib/wallet/masterkey.js
index c5e8ee53..60fba3d7 100644
--- a/lib/wallet/masterkey.js
+++ b/lib/wallet/masterkey.js
@@ -447,7 +447,6 @@ MasterKey.prototype._encrypt = co(function* encrypt(passphrase, aes) {
 
 MasterKey.prototype.getSize = function getSize() {
   var size = 0;
-  var len;
 
   if (this.encrypted) {
     size += 1;