1 files changed, 1 insertions, 1 deletions
diff --git a/iseq.c b/iseq.c
index 1e32bc31d6..a7f50970c2 100644
--- a/iseq.c
+++ b/iseq.c
@@ -246,7 +246,7 @@ rb_iseq_add_mark_object(rb_iseq_t *iseq, VALUE obj)
     if (!RTEST(iseq->mark_ary)) {
 	iseq->mark_ary = rb_ary_tmp_new(3);
 	OBJ_UNTRUST(iseq->mark_ary);
-	RBASIC(iseq->mark_ary)->klass = 0;
+	RBASIC_CLEAR_CLASS(iseq->mark_ary);
     }
     rb_ary_push(iseq->mark_ary, obj);
 }