diff --git a/ChangeLog b/ChangeLog
index caf40fd226..5c3567d9c8 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Wed Jul 30 13:17:35 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: remove unused macros.
+
 Tue Jul 29 22:21:37 2014  Masaki Suketa <masaki.suketa@nifty.ne.jp>
 
 	* ext/win32ole/win32ole.c (hash2olerec): ignore WIN32OLE_RECORD
diff --git a/gc.c b/gc.c
index f67caa62d7..0de194139f 100644
--- a/gc.c
+++ b/gc.c
@@ -635,8 +635,6 @@ VALUE *ruby_initial_gc_stress_ptr = &rb_objspace.gc_stress;
 #define finalizer_table 	objspace->finalizer_table
 #define global_list		objspace->global_list
 #define ruby_gc_stress		objspace->gc_stress
-#define monitor_level           objspace->rgengc.monitor_level
-#define monitored_object_table  objspace->rgengc.monitored_object_table
 
 #define is_lazy_sweeping(heap) ((heap)->sweep_pages != 0)
 #if SIZEOF_LONG == SIZEOF_VOIDP