diff --git a/smart_build.php b/smart_build.php
index 43734e4f..993d7858 100644
--- a/smart_build.php
+++ b/smart_build.php
@@ -169,7 +169,7 @@ function die_404() { global $config;
   else {
     header("Location: ".$config['page_404']);
   }
-
+  header("X-Accel-Expires: 120");
   die();
 }