1 files changed, 4 insertions, 2 deletions
diff --git a/src/gc.c b/src/gc.c
index 28cab05b2..ab9779e1b 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -811,12 +811,14 @@ obj_free(mrb_state *mrb, struct RBasic *obj, int end)
   case MRB_TT_SCLASS:
     mrb_gc_free_mt(mrb, (struct RClass*)obj);
     mrb_gc_free_iv(mrb, (struct RObject*)obj);
-    mrb_mc_clear_by_class(mrb, (struct RClass*)obj);
+    if (!end)
+      mrb_mc_clear_by_class(mrb, (struct RClass*)obj);
     break;
   case MRB_TT_ICLASS:
     if (MRB_FLAG_TEST(obj, MRB_FL_CLASS_IS_ORIGIN))
       mrb_gc_free_mt(mrb, (struct RClass*)obj);
-    mrb_mc_clear_by_class(mrb, (struct RClass*)obj);
+    if (!end)
+      mrb_mc_clear_by_class(mrb, (struct RClass*)obj);
     break;
   case MRB_TT_ENV:
     {