diff --git a/lib/bcoin/chain.js b/lib/bcoin/chain.js
index a4622849..d5094285 100644
--- a/lib/bcoin/chain.js
+++ b/lib/bcoin/chain.js
@@ -777,10 +777,8 @@ Chain.prototype._findDuplicates = function _findDuplicates(block, prev, callback
 
   // Check all transactions
   utils.forEachSerial(block.txs, function(tx, next) {
-    var hash = tx.hash('hex');
-
     // BIP30 - Ensure there are no duplicate txids
-    self.db.hasCoins(hash, function(err, result) {
+    self.db.hasCoins(tx.hash(), function(err, result) {
       if (err)
         return next(err);