diff --git a/index.php b/index.php
index 5c7957f3..d2cc3642 100644
--- a/index.php
+++ b/index.php
@@ -1,6 +1,6 @@
 <?php
 
-define('PROXY_START', microtime(true));
+const PROXY_START = microtime(true);
 
 require("vendor/autoload.php");