diff --git a/src/content/reference/react/StrictMode.md b/src/content/reference/react/StrictMode.md
index 4a7db874841..16e8d9e6065 100644
--- a/src/content/reference/react/StrictMode.md
+++ b/src/content/reference/react/StrictMode.md
@@ -1170,7 +1170,7 @@ export default function CatFriends() {
                   console.log('❌ Too many cats in the list!');
                 }
                 return () => {
-                  list.splice(list.indexOf(item));
+                  list.splice(list.indexOf(item), 1);
                   console.log(`❌ Removing cat from the map. Total cats: ${itemsRef.current.length}`);
                 }
               }}