diff --git a/free-programming-books.md b/free-programming-books.md
index 46c15fb78e20217b9928fdb23d054e575b4f24c1..8b76845277eef10cae91f6f4ed2a5bdfbb00f106 100644
--- a/free-programming-books.md
+++ b/free-programming-books.md
@@ -7,7 +7,7 @@
 * [ASP.NET MVC](#aspnet-mvc)
 * [Assembly Language](#assembly-language)
 * [Bash](#bash)
-* [C / C++](#c-c)
+* [C / C++](#c--c)
 * [Clojure](#clojure)
 * [CoffeeScript](#coffeescript)
 * [ColdFusion](#coldfusion)