1 files changed, 1 insertions, 0 deletions
diff --git a/internal.h b/internal.h
index c8327a4a7a..62b178e473 100644
--- a/internal.h
+++ b/internal.h
@@ -182,6 +182,7 @@ VALUE rb_int_succ(VALUE num);
 VALUE rb_int_pred(VALUE num);
 
 /* object.c */
+void rb_obj_copy_ivar(VALUE dest, VALUE obj);
 VALUE rb_obj_equal(VALUE obj1, VALUE obj2);
 VALUE rb_class_search_ancestor(VALUE klass, VALUE super);