diff --git a/src/wallet.js b/src/wallet.js
index bd30ae9..e843dba 100644
--- a/src/wallet.js
+++ b/src/wallet.js
@@ -2,6 +2,7 @@ var convert = require('./convert')
 var Transaction = require('./transaction').Transaction
 var HDNode = require('./hdwallet.js')
 var rng = require('secure-random')
+var Network = require('./network')
 
 function Wallet(seed, options) {
   if (!(this instanceof Wallet)) { return new Wallet(seed, options); }
@@ -169,11 +170,11 @@ function Wallet(seed, options) {
     })
   }
 
-  this.createTx = function(to, value, fixedFee) {
+  this.createTx = function(to, value, fixedFee, changeAddress) {
     checkDust(value)
 
     var tx = new Transaction()
-    tx.addOutput(to, value)
+    tx.addOutput(to, value, Network[network])
 
     var utxo = getCandidateOutputs(value)
     var totalInValue = 0
@@ -189,7 +190,7 @@ function Wallet(seed, options) {
 
       var change = totalInValue - value - fee
       if(change > 0 && !isDust(change)) {
-        tx.addOutput(getChangeAddress(), change)
+        tx.addOutput(changeAddress || getChangeAddress(), change, Network[network])
       }
       break
     }
@@ -245,7 +246,7 @@ function Wallet(seed, options) {
 
   function estimateFeePadChangeOutput(tx){
     var tmpTx = tx.clone()
-    tmpTx.addOutput(getChangeAddress(), 0)
+    tmpTx.addOutput(getChangeAddress(), 0, Network[network])
     return tmpTx.estimateFee()
   }
 
@@ -265,7 +266,7 @@ function Wallet(seed, options) {
     tx.ins.forEach(function(inp,i) {
       var output = me.outputs[inp.outpoint.hash + ':' + inp.outpoint.index]
       if (output) {
-        tx.sign(i, me.getPrivateKeyForAddress(output.address))
+        tx.sign(i, me.getPrivateKeyForAddress(output.address), false, Network[network])
       }
     })
     return tx
diff --git a/test/wallet.js b/test/wallet.js
index 8d65f7f..a5b31ec 100644
--- a/test/wallet.js
+++ b/test/wallet.js
@@ -458,6 +458,33 @@ describe('Wallet', function() {
       })
     })
 
+    describe('testnet', function(){
+      it('should create transaction', function(){
+        var to = 'mt7MyTVVEWnbwpF5hBn6fgnJcv95Syk2ue'
+        var wallet = new Wallet(seed, {network: 'testnet'})
+        var tx = wallet.createTx(to, value)
+        assert.equal(tx.outs.length, 1)
+      })
+    })
+
+    describe('changeAddress', function(){
+      it('should allow custom changeAddress', function(){
+        var wallet = new Wallet(seed, {network: 'testnet'})
+        var address = wallet.generateAddress()
+        utxo = {
+          "hash":"b3c5fde139dc0a3bba2729bfd5b9e16f5894131dc3dc46a91151da3053e7e3a5",
+          "outputIndex": 0,
+          "address" : address,
+          "value": 100000
+        }
+        var to = "mt7MyTVVEWnbwpF5hBn6fgnJcv95Syk2ue"
+        var changeAddress = 'mfrFjnKZUvTcvdAK2fUX5D8v1Epu5H8JCk'
+        wallet.setUnspentOutputs([utxo])
+        var tx = wallet.createTx(to, 10000, 1000, changeAddress)
+        assert.equal(tx.outs.length, 2)
+      })
+    })
+
     describe('transaction outputs', function(){
       it('includes the specified address and amount', function(){
         var tx = wallet.createTx(to, value)