diff --git a/lib/bcoin/txdb.js b/lib/bcoin/txdb.js
index f807caf9..798c3b47 100644
--- a/lib/bcoin/txdb.js
+++ b/lib/bcoin/txdb.js
@@ -1315,8 +1315,6 @@ TXDB.prototype._unconfirm = function unconfirm(tx, info, callback, force) {
  */
 
 TXDB.prototype.getHistoryHashes = function getHistoryHashes(account, callback) {
-  var self = this;
-
   if (typeof account === 'function') {
     callback = account;
     account = null;
@@ -1347,8 +1345,6 @@ TXDB.prototype.getHistoryHashes = function getHistoryHashes(account, callback) {
  */
 
 TXDB.prototype.getUnconfirmedHashes = function getUnconfirmedHashes(account, callback) {
-  var self = this;
-
   if (typeof account === 'function') {
     callback = account;
     account = null;
@@ -1379,8 +1375,6 @@ TXDB.prototype.getUnconfirmedHashes = function getUnconfirmedHashes(account, cal
  */
 
 TXDB.prototype.getCoinHashes = function getCoinHashes(account, callback) {
-  var self = this;
-
   if (typeof account === 'function') {
     callback = account;
     account = null;
@@ -1416,8 +1410,6 @@ TXDB.prototype.getCoinHashes = function getCoinHashes(account, callback) {
  */
 
 TXDB.prototype.getHeightRangeHashes = function getHeightRangeHashes(account, options, callback) {
-  var self = this;
-
   if (typeof account !== 'number') {
     callback = options;
     options = account;
@@ -1466,8 +1458,6 @@ TXDB.prototype.getHeightHashes = function getHeightHashes(height, callback) {
  */
 
 TXDB.prototype.getRangeHashes = function getRangeHashes(account, options, callback) {
-  var self = this;
-
   if (typeof account === 'function') {
     callback = account;
     account = null;
@@ -1782,7 +1772,6 @@ TXDB.prototype.getAccountCoins = function getCoins(account, callback) {
  */
 
 TXDB.prototype.fillHistory = function fillHistory(tx, callback) {
-  var self = this;
   var hash, index, coin, input;
 
   if (tx.isCoinbase()) {