diff --git a/free-programming-books.md b/free-programming-books.md
index 0448581710c5857db1c32e5332652c0715a08956..870368bc03c68bf7885b586916ee7747ab38915e 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -102,7 +102,7 @@
   * [Vue.js](#vuejs)
 * [Jenkins](#jenkins)
 * [Julia](#julia)
-* [Kotlin](#Kotlin)
+* [Kotlin](#kotlin)
 * [Language Agnostic](#language-agnostic)
   * [Algorithms & Data Structures](#algorithms--data-structures)
   * [Artificial Intelligence](#artificial-intelligence)