diff --git a/ChangeLog b/ChangeLog
index ce8cb50740..e877eb7088 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Sat Nov  9 19:37:40 2013  Narihiro Nakamura  <authornari@gmail.com>
+
+	* internal.h: prototype declarations of gc.c collect up.
+
 Sat Nov  9 15:00:16 2013  Zachary Scott  <e@zzak.io>
 
 	* io.c: [DOC] ARGF.gets may return nil [Bug #9029] patch by znz
diff --git a/internal.h b/internal.h
index e7ecbbeda4..f4e8bb3c08 100644
--- a/internal.h
+++ b/internal.h
@@ -429,6 +429,8 @@ void Init_heap(void);
 void *ruby_mimmalloc(size_t size);
 void rb_objspace_set_event_hook(const rb_event_flag_t event);
 void rb_gc_writebarrier_remember_promoted(VALUE obj);
+size_t rb_gc_count(void);
+size_t rb_obj_memsize_of(VALUE);
 
 void *ruby_sized_xrealloc(void *ptr, size_t new_size, size_t old_size) RUBY_ATTR_ALLOC_SIZE((2));
 void ruby_sized_xfree(void *x, size_t size);
@@ -817,10 +819,6 @@ void rb_mark_generic_ivar_tbl(void);
 int rb_st_insert_id_and_value(VALUE obj, st_table *tbl, ID key, VALUE value);
 st_table *rb_st_copy(VALUE obj, struct st_table *orig_tbl);
 
-/* gc.c */
-size_t rb_gc_count(void);
-size_t rb_obj_memsize_of(VALUE);
-
 RUBY_SYMBOL_EXPORT_END
 
 #if defined(__cplusplus)