diff --git a/1-js/04-object-basics/01-object/article.md b/1-js/04-object-basics/01-object/article.md
index 0fe5979fa6..94dd8e38b9 100644
--- a/1-js/04-object-basics/01-object/article.md
+++ b/1-js/04-object-basics/01-object/article.md
@@ -362,7 +362,7 @@ To walk over all keys of an object, there exists a special form of the loop: `fo
 The syntax:
 
 ```js
-for (key in object) {
+for (let key in object) {
   // executes the body for each key among object properties
 }
 ```