1 files changed, 1 insertions, 0 deletions
diff --git a/gc.h b/gc.h
index 09edafa027..ae62b091af 100644
--- a/gc.h
+++ b/gc.h
@@ -91,6 +91,7 @@ void rb_objspace_reachable_objects_from(VALUE obj, void (func)(VALUE, void *), v
 void rb_objspace_reachable_objects_from_root(void (func)(const char *category, VALUE, void *), void *data);
 int rb_objspace_markable_object_p(VALUE obj);
 int rb_objspace_internal_object_p(VALUE obj);
+int rb_objspace_marked_object_p(VALUE obj);
 
 void rb_objspace_each_objects(
     int (*callback)(void *start, void *end, size_t stride, void *data),