--- old/src/share/vm/oops/klass.cpp	2011-12-07 12:03:23.000000000 +0100
+++ new/src/share/vm/oops/klass.cpp	2011-12-07 12:03:23.000000000 +0100
@@ -144,7 +144,7 @@
     }
     kl->set_secondary_supers(NULL);
     oop_store_without_check((oop*) &kl->_primary_supers[0], k);
-    kl->set_super_check_offset(primary_supers_offset_in_bytes() + sizeof(oopDesc));
+    kl->set_super_check_offset(primary_supers_offset_in_bytes());
   }
 
   kl->set_java_mirror(NULL);