diff --git a/lib/bcoin/mempool.js b/lib/bcoin/mempool.js
index 4f0da2ab..305186b5 100644
--- a/lib/bcoin/mempool.js
+++ b/lib/bcoin/mempool.js
@@ -1806,6 +1806,9 @@ Mempool.prototype.getSize = function getSize() {
  */
 
 function MempoolEntry(options) {
+  if (!(this instanceof MempoolEntry))
+    return new MempoolEntry(options);
+
   this.tx = options.tx;
   this.height = options.height;
   this.priority = options.priority;