diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index d2469b0b..1a975a07 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -10,7 +10,6 @@ const assert = require('assert');
 const path = require('path');
 const EventEmitter = require('events');
 const bdb = require('bdb');
-const {encoding} = require('bufio');
 const {RollingFilter} = require('bfilter');
 const common = require('../blockchain/common');
 const consensus = require('../protocol/consensus');
diff --git a/lib/wallet/account.js b/lib/wallet/account.js
index feb9be56..d50f7fa2 100644
--- a/lib/wallet/account.js
+++ b/lib/wallet/account.js
@@ -14,7 +14,6 @@ const common = require('./common');
 const Script = require('../script/script');
 const WalletKey = require('./walletkey');
 const {HDPublicKey} = require('../hd/hd');
-const {encoding} = bio;
 
 /**
  * Account
diff --git a/migrate/walletdb6to7.js b/migrate/walletdb6to7.js
index 16bafb64..ff7a954f 100644
--- a/migrate/walletdb6to7.js
+++ b/migrate/walletdb6to7.js
@@ -492,7 +492,7 @@ async function updateAccount(wid, acct) {
   const type = br.readU8();
   const m = br.readU8();
   const n = br.readU8();
-  const accountIndex = br.readU32();
+  br.readU32(); // accountIndex
   const receiveDepth = br.readU32();
   const changeDepth = br.readU32();
   const nestedDepth = br.readU32();
diff --git a/test/wallet-test.js b/test/wallet-test.js
index c0e3fe6d..818530b2 100644
--- a/test/wallet-test.js
+++ b/test/wallet-test.js
@@ -1499,7 +1499,7 @@ describe('Wallet', function() {
   });
 
   it('should remove a wallet', async () => {
-    const wallet = await wdb.create({
+    await wdb.create({
       id: 'alice100'
     });
     assert(await wdb.get('alice100'));