--- old/src/cpu/zero/vm/vmreg_zero.hpp	2010-11-16 18:04:45.000000000 +0100
+++ new/src/cpu/zero/vm/vmreg_zero.hpp	2010-11-16 18:04:45.000000000 +0100
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
+ * Copyright (c) 2006, 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
@@ -22,8 +22,13 @@
  *
  */
 
+#ifndef CPU_ZERO_VM_VMREG_ZERO_HPP
+#define CPU_ZERO_VM_VMREG_ZERO_HPP
+
   bool is_Register();
   Register as_Register();
 
   bool is_FloatRegister();
   FloatRegister as_FloatRegister();
+
+#endif // CPU_ZERO_VM_VMREG_ZERO_HPP