diff --git a/app/scripts/metamask-controller.js b/app/scripts/metamask-controller.js
index 55750918b..22ae6f0f5 100644
--- a/app/scripts/metamask-controller.js
+++ b/app/scripts/metamask-controller.js
@@ -55,7 +55,6 @@ const TrezorKeyring = require('eth-trezor-keyring')
 const LedgerBridgeKeyring = require('eth-ledger-bridge-keyring')
 const EthQuery = require('eth-query')
 const ethUtil = require('ethereumjs-util')
-const sigUtil = require('eth-sig-util')
 const contractMap = require('eth-contract-metadata')
 const {
   AddressBookController,