diff --git a/ChangeLog b/ChangeLog
index 53fc83d40b..d662a80dd9 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Nov 21 22:33:59 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: RGENGC_CHECK_MODE should be 0.
+
 Thu Nov 21 21:40:00 2013  Kenta Murata  <mrkn@mrkn.jp>
 
 	* ext/bigdecimal/bigdecimal.c (VpAlloc): Fix the expr to adjust the size
diff --git a/gc.c b/gc.c
index b8eeed23ef..d34ff9c4de 100644
--- a/gc.c
+++ b/gc.c
@@ -176,7 +176,7 @@ static ruby_gc_params_t gc_params = {
  * 3: show all references
  */
 #ifndef RGENGC_CHECK_MODE
-#define RGENGC_CHECK_MODE  3
+#define RGENGC_CHECK_MODE  0
 #endif
 
 /* RGENGC_PROFILE