diff --git a/lib/lists.js b/lib/lists.js
index 5ee8a6f7..b11d4b1f 100644
--- a/lib/lists.js
+++ b/lib/lists.js
@@ -18,5 +18,10 @@ util.createMethods(List.prototype, constants.propTypes.LIST, [
 ], true);
 
 function create(realmId, info) {
-    return util.createList(List.prototype, realmId, info, true);
+    let meta = util.createList(List.prototype, realmId, info, true);
+    let list = Object.create(meta);
+
+    Object.preventExtensions(list);
+
+    return list;
 }
diff --git a/lib/util.js b/lib/util.js
index 699662dc..9bd68db9 100644
--- a/lib/util.js
+++ b/lib/util.js
@@ -21,7 +21,7 @@ function createList(prototype, realmId, info, mutable) {
 
     list[keys.resize] = function(length) {
         if (length == null) {
-            length = this.length;
+            length = list.length;
         }
         if (length == size) {
             return;
@@ -39,11 +39,11 @@ function createList(prototype, realmId, info, mutable) {
                 };
             }
 
-            Object.defineProperties(this, props);
+            Object.defineProperties(list, props);
         }
         else if (length < size) {
             for (let i = size - 1; i >= length; i--) {
-                delete this[i];
+                delete list[i];
             }
         }