diff --git a/ChangeLog b/ChangeLog
index 49351a67e6..47e9e2b556 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Mon Jul 22 10:09:46 2013  Koichi Sasada  <ko1@atdot.net>
+
+	* gc.c (gc_slot_sweep): need to add empty RVALUE as freeobj.
+
 Mon Jul 22 09:48:31 2013  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* vm_eval.c (eval_string_with_cref): use the given file name unless
diff --git a/gc.c b/gc.c
index 6be650f840..5cc1f72af0 100644
--- a/gc.c
+++ b/gc.c
@@ -2269,6 +2269,7 @@ gc_slot_sweep(rb_objspace_t *objspace, struct heap_slot *sweep_slot)
 			}
 		    }
 		    else {
+			heap_slot_add_freeobj(objspace, sweep_slot, (VALUE)p);
 			empty_num++;
 		    }
 		}