diff --git a/blog_posts/javascript-deep-freeze-object.md b/blog_posts/javascript-deep-freeze-object.md
index 2d54a0c6a..4ba041990 100644
--- a/blog_posts/javascript-deep-freeze-object.md
+++ b/blog_posts/javascript-deep-freeze-object.md
@@ -54,7 +54,7 @@ const myObj = {
 
 const deepFreeze = obj => {
   Object.keys(obj).forEach(prop => {
-    if (obj[prop] === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(v[prop]);
+    if (typeof obj[prop] === 'object' && !Object.isFrozen(obj[prop])) deepFreeze(obj[prop]);
   });
   return Object.freeze(obj);
 };