diff --git a/src/Illuminate/Foundation/Exceptions/views/illustrated-layout.blade.php b/src/Illuminate/Foundation/Exceptions/views/illustrated-layout.blade.php
index <HASH>..<HASH> 100644
--- a/src/Illuminate/Foundation/Exceptions/views/illustrated-layout.blade.php
+++ b/src/Illuminate/Foundation/Exceptions/views/illustrated-layout.blade.php
@@ -1,4 +1,4 @@
-<!doctype html>
+<!DOCTYPE html>
 <html lang="en">
     <head>
         <title>@yield('title')</title>
Use consistent uppercase for DOCTYPE

This is in line with the Google HTML guide and with other files in the framework.

<URL>