diff --git a/ChangeLog b/ChangeLog
index 084c8a37bc..55f42c2ed4 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Tue Jun 23 20:32:43 2009  Yusuke Endoh  <mame@tsg.ne.jp>
+
+	* gc.c: remove the definition of GC_DEBUG (debugging macro).
+
 Tue Jun 23 16:16:12 2009  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* configure.in (ruby_version): defaults revision to 0 when no
diff --git a/gc.c b/gc.c
index 13c21450a5..b3783bbf97 100644
--- a/gc.c
+++ b/gc.c
@@ -84,9 +84,6 @@ void *alloca ();
 
 int ruby_gc_debug_indent = 0;
 
-#undef GC_DEBUG
-#define GC_DEBUG
-
 /* for GC profile */
 #define GC_PROFILE_MORE_DETAIL 0
 typedef struct gc_profile_record {