diff --git a/lib/bip32.js b/lib/bip32.js
index cb754a7..73abfa4 100644
--- a/lib/bip32.js
+++ b/lib/bip32.js
@@ -44,8 +44,8 @@ BIP32.prototype.fromRandom = function(networkstr) {
   this.keypair = (new Keypair()).fromRandom();
   this.hasPrivateKey = true;
   this.pubKeyHash = Hash.sha256ripemd160(this.keypair.pubkey.toBuffer());
-  this.buildExtendedPublicKey();
-  this.buildExtendedPrivateKey();
+  this.buildxpubkey();
+  this.buildxprivkey();
 };
 
 BIP32.prototype.fromString = function(str) {
@@ -77,8 +77,8 @@ BIP32.prototype.fromSeed = function(bytes, networkstr) {
   this.hasPrivateKey = true;
   this.pubKeyHash = Hash.sha256ripemd160(this.keypair.pubkey.toBuffer());
 
-  this.buildExtendedPublicKey();
-  this.buildExtendedPrivateKey();
+  this.buildxpubkey();
+  this.buildxprivkey();
 
   return this;
 };
@@ -119,11 +119,11 @@ BIP32.prototype.initFromBytes = function(bytes) {
     throw new Error('Invalid key');
   }
 
-  this.buildExtendedPublicKey();
-  this.buildExtendedPrivateKey();
+  this.buildxpubkey();
+  this.buildxprivkey();
 }
 
-BIP32.prototype.buildExtendedPublicKey = function() {
+BIP32.prototype.buildxpubkey = function() {
   this.xpubkey = new Buffer([]);
 
   var v = null;
@@ -167,7 +167,7 @@ BIP32.prototype.xpubkeyString = function(format) {
   }
 }
 
-BIP32.prototype.buildExtendedPrivateKey = function() {
+BIP32.prototype.buildxprivkey = function() {
   if (!this.hasPrivateKey) return;
   this.xprivkey = new Buffer([]);
 
@@ -306,8 +306,8 @@ BIP32.prototype.deriveChild = function(i) {
 
   ret.pubKeyHash = Hash.sha256ripemd160(ret.keypair.pubkey.toBuffer());
 
-  ret.buildExtendedPublicKey();
-  ret.buildExtendedPrivateKey();
+  ret.buildxpubkey();
+  ret.buildxprivkey();
 
   return ret;
 }