diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index 4fd165f8..471eb066 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -366,15 +366,10 @@ Wallet.prototype._removeSharedKey = async function _removeSharedKey(acct, key) {
  */
 
 Wallet.prototype.setPassphrase = async function setPassphrase(old, new_) {
-  if (new_ == null) {
-    new_ = old;
-    old = null;
-  }
-
-  if (old != null)
+  if (old)
     await this.decrypt(old);
 
-  if (new_ != null)
+  if (new_)
     await this.encrypt(new_);
 };