diff --git a/lib/mempool/mempool.js b/lib/mempool/mempool.js
index 17dd54b8..85467c3b 100644
--- a/lib/mempool/mempool.js
+++ b/lib/mempool/mempool.js
@@ -1121,7 +1121,7 @@ Mempool.prototype._countDescendants = function countDescendants(entry, count, se
     if (!next)
       continue;
 
-    nhash = next.hash;
+    nhash = next.tx.hash('hex');
 
     if (set[nhash])
       continue;