diff --git a/tuple/index.hpp b/tuple/index.hpp
index d2baf443..78941e10 100644
--- a/tuple/index.hpp
+++ b/tuple/index.hpp
@@ -14,8 +14,8 @@
  * Copyright 2018 Danny Robson <danny@nerdcruft.net>
  */
 
-#ifndef CRUFT_UTIL_TUPLE_VALUE_HPP
-#define CRUFT_UTIL_TUPLE_VALUE_HPP
+#ifndef CRUFT_UTIL_TUPLE_INDEX_HPP
+#define CRUFT_UTIL_TUPLE_INDEX_HPP
 
 #include <cstddef>