diff --git a/lib/http/rpc.js b/lib/http/rpc.js
index 9ae5db0f..5a1c95b3 100644
--- a/lib/http/rpc.js
+++ b/lib/http/rpc.js
@@ -1460,7 +1460,6 @@ RPC.prototype.getMiningInfo = async function getMiningInfo(args, help) {
   let weight = 0;
   let txs = 0;
   let diff = 0;
-  let item;
 
   if (help || args.length !== 0)
     throw new RPCError(errs.MISC_ERROR, 'getmininginfo');
@@ -1470,7 +1469,7 @@ RPC.prototype.getMiningInfo = async function getMiningInfo(args, help) {
     txs = attempt.items.length + 1;
     diff = attempt.getDifficulty();
     size = 1000;
-    for (item of attempt.items)
+    for (let item of attempt.items)
       size += item.tx.getBaseSize();
   }
 
diff --git a/lib/mempool/fees.js b/lib/mempool/fees.js
index ab576961..379e979d 100644
--- a/lib/mempool/fees.js
+++ b/lib/mempool/fees.js
@@ -625,8 +625,6 @@ PolicyEstimator.prototype.processBlockTX = function processBlockTX(height, entry
  */
 
 PolicyEstimator.prototype.processBlock = function processBlock(height, entries, current) {
-  let entry;
-
   // Ignore reorgs.
   if (height <= this.bestHeight)
     return;
@@ -673,7 +671,7 @@ PolicyEstimator.prototype.processBlock = function processBlock(height, entries,
   this.feeStats.clearCurrent(height);
   this.priStats.clearCurrent(height);
 
-  for (entry of entries)
+  for (let entry of entries)
     this.processBlockTX(height, entry);
 
   this.feeStats.updateAverages();
diff --git a/lib/script/witness.js b/lib/script/witness.js
index aaa45643..263a90eb 100644
--- a/lib/script/witness.js
+++ b/lib/script/witness.js
@@ -357,11 +357,9 @@ Witness.prototype.getVarSize = function getVarSize() {
  */
 
 Witness.prototype.toWriter = function toWriter(bw) {
-  let item;
-
   bw.writeVarint(this.items.length);
 
-  for (item of this.items)
+  for (let item of this.items)
     bw.writeVarBytes(item);
 
   return bw;
diff --git a/lib/wallet/account.js b/lib/wallet/account.js
index 013aad34..66ca8e78 100644
--- a/lib/wallet/account.js
+++ b/lib/wallet/account.js
@@ -537,7 +537,7 @@ Account.prototype.derivePath = function derivePath(path, master) {
 
 Account.prototype.deriveKey = function deriveKey(branch, index, master) {
   let keys = [];
-  let key, shared, ring;
+  let key, ring;
 
   assert(typeof branch === 'number');
 
@@ -556,7 +556,7 @@ Account.prototype.deriveKey = function deriveKey(branch, index, master) {
     case Account.types.MULTISIG:
       keys.push(key.publicKey);
 
-      for (shared of this.keys) {
+      for (let shared of this.keys) {
         shared = shared.derive(branch).derive(index);
         keys.push(shared.publicKey);
       }
diff --git a/lib/wallet/http.js b/lib/wallet/http.js
index 271bd209..466ce15e 100644
--- a/lib/wallet/http.js
+++ b/lib/wallet/http.js
@@ -615,11 +615,10 @@ HTTPServer.prototype.initRouter = function initRouter() {
     let acct = valid.str('account');
     let coins = await req.wallet.getCoins(acct);
     let result = [];
-    let coin;
 
     common.sortCoins(coins);
 
-    for (coin of coins)
+    for (let coin of coins)
       result.push(coin.getJSON(this.network));
 
     res.send(200, result);
@@ -629,9 +628,8 @@ HTTPServer.prototype.initRouter = function initRouter() {
   this.get('/:id/locked', async (req, res) => {
     let locked = this.wallet.getLocked();
     let result = [];
-    let outpoint;
 
-    for (outpoint of locked)
+    for (let outpoint of locked)
       result.push(outpoint.toJSON());
 
     res.send(200, result);
@@ -840,9 +838,8 @@ HTTPServer.prototype.initSockets = function initSockets() {
   this.walletdb.on('address', (id, receive) => {
     let channel = 'w:' + id;
     let json = [];
-    let addr;
 
-    for (addr of receive)
+    for (let addr of receive)
       json.push(addr.toJSON());
 
     this.to(channel, 'wallet address', json);
diff --git a/lib/wallet/wallet.js b/lib/wallet/wallet.js
index 264ff272..ee4962f9 100644
--- a/lib/wallet/wallet.js
+++ b/lib/wallet/wallet.js
@@ -1537,13 +1537,13 @@ Wallet.prototype.estimateSize = async function estimateSize(prev) {
 Wallet.prototype.createTX = async function createTX(options, force) {
   let outputs = options.outputs;
   let mtx = new MTX();
-  let output, addr, total;
+  let addr, total;
 
   assert(Array.isArray(outputs), 'Outputs must be an array.');
   assert(outputs.length > 0, 'No outputs available.');
 
   // Add the outputs
-  for (output of outputs) {
+  for (let output of outputs) {
     output = new Output(output);
     addr = output.getAddress();
 
diff --git a/lib/wallet/walletdb.js b/lib/wallet/walletdb.js
index 8807d93e..bd044012 100644
--- a/lib/wallet/walletdb.js
+++ b/lib/wallet/walletdb.js
@@ -182,14 +182,12 @@ WalletDB.prototype._open = async function open() {
  */
 
 WalletDB.prototype._close = async function close() {
-  let wallet;
-
   await this.disconnect();
 
   if (this.http && this.options.listen)
     await this.http.close();
 
-  for (wallet of this.wallets.values())
+  for (let wallet of this.wallets.values())
     await wallet.destroy();
 
   await this.db.close();
@@ -1460,15 +1458,13 @@ WalletDB.prototype.decryptKeys = async function decryptKeys(wallet, key) {
  */
 
 WalletDB.prototype.resend = async function resend() {
-  let keys, key, wid;
-
-  keys = await this.db.keys({
+  let keys = await this.db.keys({
     gte: layout.w(0x00000000),
     lte: layout.w(0xffffffff)
   });
 
-  for (key of keys) {
-    wid = layout.ww(key);
+  for (let key of keys) {
+    let wid = layout.ww(key);
     await this.resendPending(wid);
   }
 };
@@ -1926,7 +1922,6 @@ WalletDB.prototype.addBlock = async function addBlock(entry, txs) {
 WalletDB.prototype._addBlock = async function addBlock(entry, txs) {
   let tip = BlockMeta.fromEntry(entry);
   let total = 0;
-  let tx;
 
   if (tip.height < this.state.height) {
     this.logger.warning(
@@ -1955,7 +1950,7 @@ WalletDB.prototype._addBlock = async function addBlock(entry, txs) {
       return total;
   }
 
-  for (tx of txs) {
+  for (let tx of txs) {
     if (await this._insert(tx, tip))
       total++;
   }