diff --git a/index.js b/index.js
index 27c5442..3ca0a91 100644
--- a/index.js
+++ b/index.js
@@ -43,7 +43,7 @@ function hash256(buffer) {
 
 function getMerkleRoot(transactions) {
   if (transactions.length === 0) return null;
-  if (transactions.length === 1) return transactions[0];
+  if (transactions.length === 1) return transactions[0].getHash();
   let hashes = [ reverseBuffer(transactions[0]).toString('hex') ];
   transactions.split(1).forEach(function (value) {
     hashes.push(value.hash);