--- old/src/share/vm/runtime/jniPeriodicChecker.hpp	2010-10-28 14:01:38.000000000 +0200
+++ new/src/share/vm/runtime/jniPeriodicChecker.hpp	2010-10-28 14:01:38.000000000 +0200
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2007, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
  *
  * This code is free software; you can redistribute it and/or modify it
@@ -22,6 +22,9 @@
  *
  */
 
+#ifndef SHARE_VM_RUNTIME_JNIPERIODICCHECKER_HPP
+#define SHARE_VM_RUNTIME_JNIPERIODICCHECKER_HPP
+
 class JniPeriodicCheckerTask;
 
 /*
@@ -50,3 +53,5 @@
 };
 
 void jniPeriodicChecker_exit();
+
+#endif // SHARE_VM_RUNTIME_JNIPERIODICCHECKER_HPP