diff --git a/lib/bcoin/node.js b/lib/bcoin/node.js
index 24630629..165d3a0f 100644
--- a/lib/bcoin/node.js
+++ b/lib/bcoin/node.js
@@ -197,6 +197,8 @@ Node.prototype._parseOptions = function _parseOptions(options) {
   if (options.witness == null)
     options.witness = options.network.witness;
 
+  utils.fastProp(options);
+
   return options;
 };
 
diff --git a/lib/bcoin/utils.js b/lib/bcoin/utils.js
index a55da1b2..072793cd 100644
--- a/lib/bcoin/utils.js
+++ b/lib/bcoin/utils.js
@@ -2402,3 +2402,12 @@ utils.isAlpha = function isAlpha(key) {
     && key.length <= 64
     && /^[\u0030-\u007d]+$/.test(key);
 };
+
+/**
+ * Ensure hidden-class mode for object.
+ * @param {Object} obj
+ */
+
+utils.fastProp = function fastProp(obj) {
+  ({ __proto__: obj });
+};