1 files changed, 3 insertions, 1 deletions
diff --git a/gc.h b/gc.h
index 741945349d..2a3dd92c01 100644
--- a/gc.h
+++ b/gc.h
@@ -89,7 +89,9 @@ int ruby_get_stack_grow_direction(volatile VALUE *addr);
 
 /* exports for objspace module */
 size_t rb_objspace_data_type_memsize(VALUE obj);
-VALUE rb_objspace_reachable_objects_from(VALUE obj);
+void rb_objspace_reachable_objects_from(VALUE obj, void (func)(VALUE, void *), void *data);
+int rb_objspace_markable_object_p(VALUE obj);
+int rb_objspace_internal_object_p(VALUE obj);
 
 void rb_objspace_each_objects(
     int (*callback)(void *start, void *end, size_t stride, void *data),