diff --git a/CHANGELOG.md b/CHANGELOG.md
index e14626f..79a8b40 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/)
 and this project adheres to [Semantic Versioning](http://semver.org/).
 
+## [1.12.13] - Unreleased
+### Fixed
+- Improved the code of iterator with an array.
+
 ## [1.12.12] - 2024-11-19
 ### Added
 - New option `autoDataVarname` to replace `useWith`.
@@ -271,6 +275,7 @@ First version
 [#74]: https://github.com/oscarotero/vento/issues/74
 [#83]: https://github.com/oscarotero/vento/issues/83
 
+[1.12.13]: https://github.com/oscarotero/vento/compare/v1.12.12...HEAD
 [1.12.12]: https://github.com/oscarotero/vento/compare/v1.12.11...v1.12.12
 [1.12.11]: https://github.com/oscarotero/vento/compare/v1.12.10...v1.12.11
 [1.12.10]: https://github.com/oscarotero/vento/compare/v0.12.9...v1.12.10
diff --git a/plugins/for.ts b/plugins/for.ts
index 3b85d0b..794733f 100644
--- a/plugins/for.ts
+++ b/plugins/for.ts
@@ -59,9 +59,7 @@ function toIterator(
   }
 
   if (Array.isArray(item)) {
-    return withKeys
-      ? Object.entries(item).map(([key, value]) => [parseInt(key, 10), value])
-      : item;
+    return withKeys ? item.map((value, i) => [i, value]) : item;
   }
 
   if (typeof item === "function") {