diff --git a/src/mrb_set.c b/src/mrb_set.c
deleted file mode 100644
index d6d86cff3..000000000
--- a/src/mrb_set.c
+++ /dev/null
@@ -1,18 +0,0 @@
-/*
-** mrb_set.c - Set class
-**
-** Copyright (c) yui-knk 2014
-**
-** See Copyright Notice in LICENSE
-*/
-
-#include "mruby.h"
-
-void mrb_mruby_set_gem_init(mrb_state *mrb)
-{
-}
-
-void mrb_mruby_set_gem_final(mrb_state *mrb)
-{
-}
-
diff --git a/src/mrb_set.h b/src/mrb_set.h
deleted file mode 100644
index 36f3a1306..000000000
--- a/src/mrb_set.h
+++ /dev/null
@@ -1,6 +0,0 @@
-/*
-** mrb_set.h - Set class 
-**
-** See Copyright Notice in LICENSE
-*/
-