--- old/src/cpu/x86/vm/assembler_x86.hpp	2014-09-11 23:19:41.000000000 +0200
+++ new/src/cpu/x86/vm/assembler_x86.hpp	2014-09-11 23:19:41.000000000 +0200
@@ -1005,6 +1005,7 @@
 
   void cmpxchg8 (Address adr);
 
+  void cmpxchgb(Register reg, Address adr);
   void cmpxchgl(Register reg, Address adr);
 
   void cmpxchgq(Register reg, Address adr);