diff --git a/ChangeLog b/ChangeLog
index ffa4e433c2..9f6d6adb9b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Aug 27 04:02:11 2011  Koichi Sasada  <ko1@atdot.net>
+
+	* vm_core.h: add a decl. of rb_autoloading_value().
+
 Fri Aug 26 19:12:08 2011  Hiroshi Nakamura  <nahi@ruby-lang.org>
 
 	* variable.c: Make autoload thread-safe. See #921.
diff --git a/vm_core.h b/vm_core.h
index 0120def4b9..269e22d332 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -674,6 +674,8 @@ void ruby_thread_init_stack(rb_thread_t *th);
 NOINLINE(void rb_gc_save_machine_context(rb_thread_t *));
 void rb_gc_mark_machine_stack(rb_thread_t *th);
 
+int rb_autoloading_value(VALUE mod, ID id, VALUE* value);
+
 #define sysstack_error GET_VM()->special_exceptions[ruby_error_sysstack]
 
 /* for thread */