diff --git a/ChangeLog b/ChangeLog
index 0a8b33bf6e..6bb868868b 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Oct 29 15:43:25 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
+
+	* vm_core.h (rb_name_err_mesg_new): added prototype.
+
 Thu Oct 29 13:53:18 2009  Yukihiro Matsumoto  <matz@ruby-lang.org>
 
 	* array.c (rb_ary_to_ary): do not use #respond_to? to detect
diff --git a/vm_core.h b/vm_core.h
index 52105ec9ea..3d0f239f54 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -618,6 +618,7 @@ VALUE rb_make_backtrace(void);
 typedef int rb_backtrace_iter_func(void *, VALUE, int, VALUE);
 int rb_backtrace_each(rb_backtrace_iter_func *iter, void *arg);
 rb_control_frame_t *rb_vm_get_ruby_level_next_cfp(rb_thread_t *th, rb_control_frame_t *cfp);
+VALUE rb_name_err_mesg_new(VALUE obj, VALUE mesg, VALUE recv, VALUE method);
 
 NOINLINE(void rb_gc_save_machine_context(rb_thread_t *));