1 files changed, 1 insertions, 0 deletions
diff --git a/iseq.c b/iseq.c
index 3c68264262..e679108558 100644
--- a/iseq.c
+++ b/iseq.c
@@ -113,6 +113,7 @@ rb_iseq_mark(const rb_iseq_t *iseq)
 	rb_gc_mark(body->location.base_label);
 	rb_gc_mark(body->location.path);
 	RUBY_MARK_UNLESS_NULL(body->location.absolute_path);
+	RUBY_MARK_UNLESS_NULL((VALUE)body->parent_iseq);
     }
 
     if (FL_TEST(iseq, ISEQ_NOT_LOADED_YET)) {