diff --git a/ChangeLog b/ChangeLog
index ee6b167c0e..a08d6b3ba1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Tue Nov  5 20:14:32 2013  Masaya Tarui  <tarui@ruby-lang.org>
+
+	* gc.c (is_live_object): A hidden object may be a live object.
+	  [ruby-dev:47788] [Bug #9072]
+
 Tue Nov  5 13:37:19 2013  Koichi Sasada  <ko1@atdot.net>
 
 	* gc.c: add support to estimate increase of oldspace memory usage.
diff --git a/gc.c b/gc.c
index 292cb74793..1356702fa1 100644
--- a/gc.c
+++ b/gc.c
@@ -2193,7 +2193,6 @@ is_live_object(rb_objspace_t *objspace, VALUE ptr)
       case 0: case T_ZOMBIE:
 	return FALSE;
     }
-    if (RBASIC(ptr)->klass == 0) return FALSE;
     if (is_dead_object(objspace, ptr)) return FALSE;
     return TRUE;
 }