diff --git a/lib/blockchain/common.js b/lib/blockchain/common.js
index ca5f1eff..efb0ce55 100644
--- a/lib/blockchain/common.js
+++ b/lib/blockchain/common.js
@@ -62,7 +62,7 @@ exports.thresholdStates = {
 exports.flags = {
   VERIFY_NONE: 0,
   VERIFY_POW: 1 << 0,
-  VERIFY_BODY: 1 << 1,
+  VERIFY_BODY: 1 << 1
 };
 
 /**
diff --git a/lib/mining/minerblock.js b/lib/mining/minerblock.js
index a577857a..3eec53df 100644
--- a/lib/mining/minerblock.js
+++ b/lib/mining/minerblock.js
@@ -353,11 +353,12 @@ MinerBlock.prototype.extraNonce = function extraNonce() {
  */
 
 MinerBlock.prototype.addTX = function addTX(tx, view) {
+  var hash = tx.hash('hex');
   var item, weight, sigops;
 
   assert(!tx.mutable, 'Cannot add mutable TX to block.');
 
-  if (this.block.hasTX(tx))
+  if (this.block.hasTX(hash))
     return false;
 
   item = BlockEntry.fromTX(tx, view, this);
diff --git a/lib/net/pool.js b/lib/net/pool.js
index a4f207c0..84fbf5f9 100644
--- a/lib/net/pool.js
+++ b/lib/net/pool.js
@@ -2153,7 +2153,7 @@ Pool.prototype._handleTX = co(function* handleTX(peer, packet) {
 
   if (peer.merkleBlock) {
     assert(peer.merkleMatches > 0);
-    if (peer.merkleBlock.hasTX(tx)) {
+    if (peer.merkleBlock.hasTX(hash)) {
       peer.merkleBlock.addTX(tx);
       if (--peer.merkleMatches === 0) {
         yield this._addBlock(peer, peer.merkleBlock, flags);