diff --git a/1-js/09-classes/06-instanceof/article.md b/1-js/09-classes/06-instanceof/article.md
index f9db989ca9..c3bd1e03a1 100644
--- a/1-js/09-classes/06-instanceof/article.md
+++ b/1-js/09-classes/06-instanceof/article.md
@@ -59,7 +59,7 @@ The algorithm of `obj instanceof Class` works roughly as follows:
// anything with canEat property is an animal
class Animal {
static [Symbol.hasInstance](obj) {
- if (obj.canEat) return true;
+ if ('canEat' in obj) return true;
}
}
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