1 files changed, 2 insertions, 1 deletions
diff --git a/gc.c b/gc.c
index c7e306c2e3..69e9e72a6d 100644
--- a/gc.c
+++ b/gc.c
@@ -4222,7 +4222,8 @@ gc_mark_roots(rb_objspace_t *objspace, int full_mark, const char **categoryp)
 
     MARK_CHECKPOINT("vm");
     SET_STACK_END;
-    th->vm->self ? rb_gc_mark(th->vm->self) : rb_vm_mark(th->vm);
+    rb_vm_mark(th->vm);
+    if (th->vm->self) gc_mark_ptr(objspace, th->vm->self);
 
     MARK_CHECKPOINT("finalizers");
     mark_tbl(objspace, finalizer_table);