diff --git a/cmake/corsika.hpp.in b/cmake/corsika.hpp.in
index f17f89efdaa3302039050da5dcdb27a2ff2f2fee..a222039800b0f9b257cdf2f96f58b6216f821afa 100644
--- a/cmake/corsika.hpp.in
+++ b/cmake/corsika.hpp.in
@@ -1,5 +1,15 @@
+/*
+ * (c) Copyright 2020 CORSIKA Project, corsika-project@lists.kit.edu
+ *
+ * This software is distributed under the terms of the GNU General Public
+ * Licence version 3 (GPL Version 3). See file LICENSE for a full version of
+ * the license.
+ */
+
 #pragma once
 
+#include <string>
+
 namespace corsika {
 
   /**
@@ -25,8 +35,6 @@ namespace corsika {
    * For more information about the project, see @ref md_README.
    */
 
-  // clang-format-off
-
   /*! Usage:
    *  to get the version R.X.Y.Z,
    *  x: major version
@@ -76,6 +84,4 @@ namespace corsika {
 
   static std::string const CORSIKA_DATA_DIR = "@CORSIKA_CMAKE_DATA_DIR@";
 
-  // clang-format-on
-
 } // namespace corsika