diff --git a/common/utils/string_utils.hpp b/common/utils/string_utils.hpp
index b35e7e36..5ab6ad50 100644
--- a/common/utils/string_utils.hpp
+++ b/common/utils/string_utils.hpp
@@ -1,6 +1,6 @@
/***
This file is part of snapcast
- Copyright (C) 2014-2020 Johannes Pohl
+ Copyright (C) 2014-2021 Johannes Pohl
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
@@ -16,8 +16,8 @@
along with this program. If not, see .
***/
-#ifndef STRING_UTILS_H
-#define STRING_UTILS_H
+#ifndef STRING_UTILS_HPP
+#define STRING_UTILS_HPP
#include
#include