--- old/src/cpu/x86/vm/cppInterpreter_x86.hpp	2010-11-10 12:58:00.000000000 +0100
+++ new/src/cpu/x86/vm/cppInterpreter_x86.hpp	2010-11-10 12:58:00.000000000 +0100
@@ -22,6 +22,9 @@
  *
  */
 
+#ifndef CPU_X86_VM_CPPINTERPRETER_X86_HPP
+#define CPU_X86_VM_CPPINTERPRETER_X86_HPP
+
 
   protected:
 
@@ -31,3 +34,5 @@
   // Run with +PrintInterpreter to get the VM to print out the size.
   // Max size with JVMTI
   const static int InterpreterCodeSize = 168 * 1024;
+
+#endif // CPU_X86_VM_CPPINTERPRETER_X86_HPP