diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index 75f3b717..17dd54b8 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -1112,7 +1112,7 @@ Mempool.prototype.countDescendants = function countDescendants(entry) {
 
 Mempool.prototype._countDescendants = function countDescendants(entry, count, set) {
   var tx = entry.tx;
-  var hash = entry.hash;
+  var hash = tx.hash('hex');
   var i, next, nhash;
 
   for (i = 0; i < tx.outputs.length; i++) {