diff --git a/lib/bcoin/wallet.js b/lib/bcoin/wallet.js
index 2102c047..ccfcc3d6 100644
--- a/lib/bcoin/wallet.js
+++ b/lib/bcoin/wallet.js
@@ -755,30 +755,6 @@ Wallet.prototype.createKey = function createKey(change, index) {
   };
 };
 
-Wallet.prototype._deriveKey = function _deriveKey(purposeKey, cosignerIndex, change, index) {
-  var path, key;
-
-  assert(this.derivation !== 'normal');
-
-  if (typeof change === 'string') {
-    path = change;
-  } else {
-    if (index == null)
-      index = change ? this.changeDepth : this.addressDepth;
-    path = 'm/' + (change ? 1 : 0) + '/' + index;
-  }
-
-  key = this.derivation === 'bip45'
-    ? purposeKey.derive(cosignerIndex)
-    : purposeKey;
-
-  key = key.derive(path);
-
-  key.path = path;
-
-  return key;
-};
-
 Wallet.prototype.setAddressDepth = function setAddressDepth(depth) {
   assert(this.derivation !== 'normal');
   for (var i = this.addressDepth; i < depth; i++)