diff --git a/src/gc.c b/src/gc.c
index 86ee65ae6..fe394969a 100644
--- a/src/gc.c
+++ b/src/gc.c
@@ -996,7 +996,7 @@ incremental_marking_phase(mrb_state *mrb, mrb_gc *gc, size_t limit)
 static void
 final_marking_phase(mrb_state *mrb, mrb_gc *gc)
 {
-  mark_context_stack(mrb, mrb->root_c);
+  mark_context(mrb, mrb->root_c);
   gc_mark_gray_list(mrb, gc);
   mrb_assert(gc->gray_list == NULL);
   gc->gray_list = gc->atomic_gray_list;