diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 76f83a51..d92b1173 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -79,7 +79,6 @@ function Mempool(options) {
 
   this.size = 0;
   this.totalOrphans = 0;
-  this.totalSpent = 0;
   this.totalTX = 0;
 
   this.waiting = {};
@@ -120,7 +119,7 @@ utils.inherits(Mempool, AsyncObject);
 
 Mempool.prototype._open = function open(callback) {
   var self = this;
-  var size = (self.maxSize / 1024).toFixed(2);
+  var size = (this.maxSize / 1024).toFixed(2);
   this.chain.open(function(err) {
     if (err)
       return callback(err);
@@ -137,7 +136,7 @@ Mempool.prototype._open = function open(callback) {
  * @param {Function} callback
  */
 
-Mempool.prototype._close = function destroy(callback) {
+Mempool.prototype._close = function close(callback) {
   callback();
 };
 
@@ -1405,7 +1404,6 @@ Mempool.prototype.trackEntry = function trackEntry(entry) {
     }
   }
 
-  this.totalSpent += tx.inputs.length;
   this.size += this.memUsage(tx);
   this.totalTX++;
 };
@@ -1452,7 +1450,6 @@ Mempool.prototype.untrackEntry = function untrackEntry(entry) {
     }
   }
 
-  this.totalSpent -= tx.inputs.length;
   this.size -= this.memUsage(tx);
   this.totalTX--;
 };