diff --git a/lib/mempool/mempoolentry.js b/lib/mempool/mempoolentry.js
index 0d6df75b..234a06d6 100644
--- a/lib/mempool/mempoolentry.js
+++ b/lib/mempool/mempoolentry.js
@@ -9,6 +9,9 @@
 var policy = require('../protocol/policy');
 var util = require('../utils/util');
 var Script = require('../script/script');
+var BufferReader = require('../utils/reader');
+var StaticWriter = require('../utils/staticwriter');
+var TX = require('../primitives/tx');
 
 /**
  * Represents a mempool entry.
@@ -192,7 +195,7 @@ MempoolEntry.prototype.isFree = function isFree(height) {
  */
 
 MempoolEntry.prototype.getSize = function getSize() {
-  return tx.getSize() + 37;
+  return this.tx.getSize() + 37;
 };
 
 /**
diff --git a/lib/primitives/block.js b/lib/primitives/block.js
index 22514404..cf64b744 100644
--- a/lib/primitives/block.js
+++ b/lib/primitives/block.js
@@ -499,7 +499,7 @@ Block.prototype.verifyBody = function verifyBody(ret) {
  */
 
 Block.prototype.getCoinbaseHeight = function getCoinbaseHeight() {
-  var coinbase, height;
+  var coinbase;
 
   if (this.version < 2)
     return -1;