diff --git a/src/dir.c b/src/dir.c
index e061817fa..9aab0b1cb 100644
--- a/src/dir.c
+++ b/src/dir.c
@@ -226,3 +226,8 @@ mrb_mruby_dir_gem_init(mrb_state *mrb)
   mrb_define_method(mrb, d, "seek", mrb_dir_seek, ARGS_REQ(1));
   mrb_define_method(mrb, d, "tell", mrb_dir_tell, ARGS_NONE());
 }
+
+void
+mrb_mruby_dir_gem_final(mrb_state *mrb)
+{
+}