diff --git a/pages/genericPage.class.php b/pages/genericPage.class.php
index 412fcdeb..423d3129 100644
--- a/pages/genericPage.class.php
+++ b/pages/genericPage.class.php
@@ -482,7 +482,8 @@ class GenericPage
         if (isset($this->tabId))
             $this->pageTemplate['activeTab'] = $this->tabId;
 
-        header("HTTP/1.0 404 Not Found", true, 404);
+        header('HTTP/1.0 404 Not Found', true, 404);
+
         $this->display('list-page-generic');
         exit();
     }
@@ -500,13 +501,17 @@ class GenericPage
 
         Util::arraySumByKey($this->mysql, DB::Aowow()->getStatistics(), DB::World()->getStatistics());
 
-        header("HTTP/1.0 404 Not Found", true, 404);
+        header('HTTP/1.0 404 Not Found', true, 404);
+
         $this->display('list-page-generic');
         exit();
     }
 
     public function maintenance()                           // display brb gnomes
     {
+        header('HTTP/1.0 503 Service Temporarily Unavailable', true, 503);
+        header('Retry-After: '.(3 * HOURS));
+
         $this->display('maintenance');
         exit();
     }