diff --git a/public/instance/proxy/opac-de-23/index.php b/public/instance/proxy/opac-de-23/index.php
index 3f8bfcc18e46b1251b8dca301d38d391df33631b..6b7c049353b6a3354ae8ac22ac8ac8b78600df1e 100644
--- a/public/instance/proxy/opac-de-23/index.php
+++ b/public/instance/proxy/opac-de-23/index.php
@@ -89,7 +89,7 @@ switch ($format) {
             $sourceUri = sprintf(PICA_TEMPLATE, $ident);
             $content = transform($sourceUri, $templateUri);
             if ($content) {
-                $response = new Response($content, 200, array('Content-Type' => 'application/rdf+xml'));
+                $response = new Response($content, 200, array('Content-Type' => 'application/mods+xml'));
                 break;
             }
         }