diff --git a/ChangeLog b/ChangeLog
index 6710fa7b91..5511fa3b4d 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jul  7 12:45:51 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c: revert miss-commit.
+
 Mon Jul  7 12:40:59 2014  Koichi Sasada  <ko1@atdot.net>
 
 	* parse.y: need to use updated (re-created) symbols.
diff --git a/gc.c b/gc.c
index a4f5c355e7..fd84749dd5 100644
--- a/gc.c
+++ b/gc.c
@@ -204,7 +204,7 @@ static ruby_gc_params_t gc_params = {
  * 4: show all references
  */
 #ifndef RGENGC_CHECK_MODE
-#define RGENGC_CHECK_MODE  3
+#define RGENGC_CHECK_MODE  0
 #endif
 
 /* RGENGC_PROFILE