diff --git a/lib/bcoin/blockdb.js b/lib/bcoin/blockdb.js
index 10229576..e597a78b 100644
--- a/lib/bcoin/blockdb.js
+++ b/lib/bcoin/blockdb.js
@@ -876,6 +876,7 @@ BlockDB.prototype.hasBlock = function hasBlock(hash, callback) {
 };
 
 BlockDB.prototype.hasCoin = function hasCoin(hash, index, callback) {
+  var self = this;
   var id = 'u/t/' + hash + '/' + index;
 
   this.index.get(id, function(err, record) {
@@ -895,6 +896,7 @@ BlockDB.prototype.hasCoin = function hasCoin(hash, index, callback) {
 };
 
 BlockDB.prototype.hasTX = function hasTX(hash, callback) {
+  var self = this;
   var id = 't/t/' + hash;
 
   this.index.get(id, function(err, record) {