diff --git a/runtime/lib/buffer_widget.rb b/runtime/lib/buffer_widget.rb
new file mode 100644
index 0000000..6e96326
--- /dev/null
+++ b/runtime/lib/buffer_widget.rb
@@ -0,0 +1,5 @@
+require "widget"
+
+class BufferWidget
+  include Widget
+end
diff --git a/runtime/lib/window.rb b/runtime/lib/window.rb
index 3695887..ae584ae 100644
--- a/runtime/lib/window.rb
+++ b/runtime/lib/window.rb
@@ -1,4 +1,5 @@
 require "set"
+require "widget"
 
 class Window
 
diff --git a/runtime/main.rb b/runtime/main.rb
index b1b7ec6..f96805d 100644
--- a/runtime/main.rb
+++ b/runtime/main.rb
@@ -3,6 +3,7 @@ def init_loadpath
 end
 
 def load_lib_files
+  require "buffer_widget"
   require "gl"
   require "gl_program"
   require "runtime"
diff --git a/src/BufferWidget.cc b/src/BufferWidget.cc
new file mode 100644
index 0000000..b8d395c
--- /dev/null
+++ b/src/BufferWidget.cc
@@ -0,0 +1,9 @@
+#include "BufferWidget.h"
+#include "ruby.h"
+
+VALUE ruby_class;
+
+void BufferWidget_Init()
+{
+    ruby_class = rb_define_class("BufferWidget", rb_cObject);
+}
diff --git a/src/BufferWidget.h b/src/BufferWidget.h
new file mode 100644
index 0000000..d846201
--- /dev/null
+++ b/src/BufferWidget.h
@@ -0,0 +1,6 @@
+#ifndef BUFFERWIDGET_H
+#define BUFFERWIDGET_H
+
+void BufferWidget_Init();
+
+#endif
diff --git a/src/main.cc b/src/main.cc
index 789ccbf..7a2a7f7 100644
--- a/src/main.cc
+++ b/src/main.cc
@@ -2,6 +2,7 @@
 #include "ruby.h"
 
 #include "Buffer.h"
+#include "BufferWidget.h"
 #include "Font.h"
 #include "GL.h"
 #include "GLProgram.h"
@@ -56,6 +57,7 @@ static int bootstrap()
     int err_state = 0;
 
     Buffer_Init();
+    BufferWidget_Init();
     Font_Init();
     GL_Init();
     GLProgram_Init();