diff --git a/www/saml2/idp/metadata.php b/www/saml2/idp/metadata.php
index d6511a4d98518941ee8732d360b01e3d75ac605a..2f6807e8ecf6d5d66722c58367c0215e949b0dcd 100644
--- a/www/saml2/idp/metadata.php
+++ b/www/saml2/idp/metadata.php
@@ -244,7 +244,7 @@ try {
         $t->data['metadataflat'] = htmlspecialchars($metaflat);
         $t->send();
     } else {
-        header('Content-Type: application/xml');
+        header('Content-Type: application/samlmetadata+xml');
 
         echo $metaxml;
         exit(0);