--- old/src/os/windows/vm/os_windows.hpp	2010-11-16 18:05:53.000000000 +0100
+++ new/src/os/windows/vm/os_windows.hpp	2010-11-16 18:05:53.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 1997, 2008, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 1997, 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 OS_WINDOWS_VM_OS_WINDOWS_HPP
+#define OS_WINDOWS_VM_OS_WINDOWS_HPP
+
 // Win32_OS defines the interface to windows operating systems
 
 class win32 {
@@ -124,3 +127,5 @@
     }
 
 } ;
+
+#endif // OS_WINDOWS_VM_OS_WINDOWS_HPP