diff --git a/include/private/gcconfig.h b/include/private/gcconfig.h
index 348255d..5e0b7cd 100644
--- a/include/private/gcconfig.h
+++ b/include/private/gcconfig.h
@@ -697,6 +697,12 @@ EXTERN_C_BEGIN
 #   define mach_type_known
 # endif
 
+# if defined(__GENODE__) && (defined(__amd64__) || defined(__x86_64__))
+#    define X86_64
+#    define GENODE
+#    define mach_type_known
+# endif
+
 /* Feel free to add more clauses here */
 
 /* Or manually define the machine type here.  A machine type is         */