diff --git a/ChangeLog b/ChangeLog
index 310645bab4..98dc8777b1 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,7 @@
+Thu Jun 18 14:35:28 2015  Koichi Sasada  <ko1@atdot.net>
+
+	* ext/objspace/objspace.c (count_imemo_objects): support imemo_ment.
+
 Thu Jun 18 13:32:46 2015  Nobuyoshi Nakada  <nobu@ruby-lang.org>
 
 	* error.c (name_err_receiver): add NameError#receiver method.
diff --git a/ext/objspace/objspace.c b/ext/objspace/objspace.c
index bc53b8462b..7d461831ac 100644
--- a/ext/objspace/objspace.c
+++ b/ext/objspace/objspace.c
@@ -569,6 +569,7 @@ count_imemo_objects(int argc, VALUE *argv, VALUE self)
 	imemo_type_ids[3] = rb_intern("imemo_throw_data");
 	imemo_type_ids[4] = rb_intern("imemo_ifunc");
 	imemo_type_ids[5] = rb_intern("imemo_memo");
+	imemo_type_ids[6] = rb_intern("imemo_ment");
     }
 
     rb_objspace_each_objects(count_imemo_objects_i, (void *)hash);