diff --git a/src/class.c b/src/class.c
index 28e21a3fe..ac1065d01 100644
--- a/src/class.c
+++ b/src/class.c
@@ -565,7 +565,6 @@ mrb_class_inherited(mrb_state *mrb, struct RClass *super, struct RClass *klass)
     super = mrb->object_class;
   super->flags |= MRB_FL_CLASS_IS_INHERITED;
   s = mrb_obj_value(super);
-  mrb_mc_clear_by_class(mrb, klass);
   mid = MRB_SYM(inherited);
   if (!mrb_func_basic_p(mrb, s, mid, mrb_do_nothing)) {
     mrb_value c = mrb_obj_value(klass);