diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index 66d60a10..8992ca03 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -697,6 +697,9 @@ utils.merge = function merge(target) {
   return target;
 };
 
+if (Object.assign)
+  utils.merge = Object.assign;
+
 /**
  * Assertion.
  * @function