diff --git a/libraries/error.inc.php b/libraries/error.inc.php
index da185a66b9..81e5d9c69f 100644
--- a/libraries/error.inc.php
+++ b/libraries/error.inc.php
@@ -12,6 +12,7 @@ if (! defined('PHPMYADMIN')) {
 }
 
 if (! defined('TESTSUITE')) {
+    header('HTTP/1.1 500 Internal Server Error');
     header('Content-Type: text/html; charset=utf-8');
 }
 ?>