diff --git a/app/scripts/transaction-manager.js b/app/scripts/transaction-manager.js
index 9462d166e..c33c4ed16 100644
--- a/app/scripts/transaction-manager.js
+++ b/app/scripts/transaction-manager.js
@@ -3,6 +3,7 @@ const async = require('async')
 const extend = require('xtend')
 const Semaphore = require('semaphore')
 const ethUtil = require('ethereumjs-util')
+const BN = require('ethereumjs-util').BN
 const TxProviderUtil = require('./lib/tx-utils')
 const createId = require('./lib/random-id')
 
diff --git a/test/unit/tx-manager-test.js b/test/unit/tx-manager-test.js
index d5d386234..5f18e357f 100644
--- a/test/unit/tx-manager-test.js
+++ b/test/unit/tx-manager-test.js
@@ -23,7 +23,7 @@ describe('Transaction Manager', function() {
       var sample = {
         value: '0x01'
       }
-      var res = txManager.validateTxParams(sample, (err) => {
+      var res = txManager.txProviderUtils.validateTxParams(sample, (err) => {
         assert.equal(err, null, 'no error')
       })
     })
@@ -33,7 +33,7 @@ describe('Transaction Manager', function() {
       var sample = {
         value: '-0x01'
       }
-      var res = txManager.validateTxParams(sample, (err) => {
+      var res = txManager.txProviderUtils.validateTxParams(sample, (err) => {
         assert.ok(err, 'error')
       })
     })