diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index c952bcd5..932936fe 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -41,8 +41,8 @@ function Mempool(node, options) {
   this.totalOrphans = 0;
   this.coins = {};
   this.txs = {};
-  this.psIndex = new BinaryIndex;
-  this.addressMap = new AddressMap;
+  this.psIndex = new BinaryIndex();
+  this.addressMap = new AddressMap();
   this.orphans = {};
   this.waiting = {};
   this.spent = {};
@@ -1378,9 +1378,7 @@ BinaryIndex.prototype.insert = function insert(tx) {
 
 BinaryIndex.prototype.remove = function remove(tx) {
   var hash = tx.hash();
-  var index;
-
-  index = binarySearch(this.data, hash);
+  var index = binarySearch(this.data, hash);
 
   if (index !== -1) {
     this.index.splice(index, 1);