diff --git a/hdkey.js b/hdkey.js
index ac95fdb..4b086db 100644
--- a/hdkey.js
+++ b/hdkey.js
@@ -1,5 +1,5 @@
-const HDKey = require('hdkey')
-const Wallet = require('./index.js')
+var HDKey = require('hdkey')
+var Wallet = require('./index.js')
 
 function EthereumHDKey () {
 }
diff --git a/provider-engine.js b/provider-engine.js
index d22aa04..d9ec043 100644
--- a/provider-engine.js
+++ b/provider-engine.js
@@ -1,7 +1,7 @@
 'use strict'
 
-const inherits = require('util').inherits
-const HookedWalletEthTxSubprovider = require('web3-provider-engine/subproviders/hooked-wallet-ethtx')
+var inherits = require('util').inherits
+var HookedWalletEthTxSubprovider = require('web3-provider-engine/subproviders/hooked-wallet-ethtx')
 
 module.exports = WalletSubprovider