diff --git a/themes/bootstrap3/templates/error/unavailable.phtml b/themes/bootstrap3/templates/error/unavailable.phtml
index 4cac53eb415955956d1f4116b156a194cb3274c4..9ebaa42658ffb4cf15b59ba942df27847db0006d 100644
--- a/themes/bootstrap3/templates/error/unavailable.phtml
+++ b/themes/bootstrap3/templates/error/unavailable.phtml
@@ -7,7 +7,7 @@
 
   $this->layout()->breadcrumbs = '<li class="active">Error</li>';
 ?>
-<div class="alert alert-danger">
+<div class="alert alert-warning">
   <h2><?=$this->transEsc('System Unavailable')?></h2>
   <p>
     <?=$this->transEsc('The system is currently unavailable due to system maintenance')?>.