diff --git a/ChangeLog b/ChangeLog
index 232c0a28ab..574d42411a 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Thu Apr 10 14:40:18 2014  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (rb_gc_writebarrier_unprotect_promoted): disable to dump debug
+	  message when RGENGC_CHECK_MODE == 0.
+
 Thu Apr 10 08:13:47 2014  Tanaka Akira  <akr@fsij.org>
 
 	* signal.c (check_stack_overflow): Don't use ucontext_t if ucontext.h
diff --git a/gc.c b/gc.c
index f6ffdbec95..77ff153a00 100644
--- a/gc.c
+++ b/gc.c
@@ -4807,7 +4807,7 @@ rb_gc_writebarrier_unprotect_promoted(VALUE obj)
 	if (!RVALUE_WB_PROTECTED(obj)) rb_bug("rb_gc_writebarrier_unprotect_promoted: called on shady object");
     }
 
-    rgengc_report(0, objspace, "rb_gc_writebarrier_unprotect_promoted: %p (%s)%s\n", (void *)obj, obj_type_name(obj),
+    rgengc_report(1, objspace, "rb_gc_writebarrier_unprotect_promoted: %p (%s)%s\n", (void *)obj, obj_type_name(obj),
 		  rgengc_remembered(objspace, obj) ? " (already remembered)" : "");
 
     if (RVALUE_OLD_P(obj)) {