diff --git a/runtime/lib/window.rb b/runtime/lib/window.rb
index 40bb356..2f94d19 100644
--- a/runtime/lib/window.rb
+++ b/runtime/lib/window.rb
@@ -16,6 +16,7 @@ class Window
   end
 
   def initialize
+    super
     @programs = {}
     load_shaders
     Window.register(self)