diff --git a/templates/includes/header.php b/templates/includes/header.php
index c84dcb942c7d587d7fb1452ad7ee00301f193d0d..6ddad9279fe0ffe99305c0dcde30b288a20bbd16 100644
--- a/templates/includes/header.php
+++ b/templates/includes/header.php
@@ -206,3 +206,7 @@ if (!empty($this->data['htmlinject']['htmlContentPre'])) {
         echo $c;
     }
 }
+$config = \SimpleSAML\Configuration::getInstance();
+if(! $config->getBoolean('production', true)) {
+  echo '<div class="caution">' . $this->t('{preprodwarning:warning:warning}'). '</div>';
+}