diff --git a/lib/wallet.js b/lib/wallet.js
index 1770e31..76a4744 100644
--- a/lib/wallet.js
+++ b/lib/wallet.js
@@ -80,13 +80,13 @@ Wallet.prototype.updateMainData = function(params) {
     });
 };
 
-Wallet.prototype.delete = function(params) {
-  params = _.extend(params, _.pick(this, [
+Wallet.prototype.delete = function() {
+  var params = _.pick(this, [
     'server',
     'walletId',
     'username',
     'lockVersion'
-  ]));
+  ]);
 
   return protocol.deleteWallet(params);
 };