diff --git a/example.rb b/example.rb
index 1006320..315bd15 100755
--- a/example.rb
+++ b/example.rb
@@ -26,7 +26,8 @@ class Example
       {
         vec2 scaled_pos = vec2((offset.x - screen_size.x / 2) / screen_size.x * 2,
                                (offset.y - screen_size.y / 2) / screen_size.y * 2);
-        pos_i = vec4(pos + scaled_pos, 0, 1);
+        pos_i = vec4(pos.x * screen_size.y / screen_size.x + scaled_pos.x,
+                     pos.y + scaled_pos.y, 0, 1);
         gl_Position = pos_i;
       }
     EOS