diff --git a/files_opds/lib/feed.php b/files_opds/lib/feed.php
index 9408db6..098ebd6 100644
--- a/files_opds/lib/feed.php
+++ b/files_opds/lib/feed.php
@@ -120,7 +120,7 @@ class Feed
 			/* Note: relative URL should be enough (RFC7231) but some OPDS clients
 			 * (especially those in dedicated book readers) might not support them
 			 * 
-			 * header("Location: " . \OC_Helper::mimetypeIcon($i->getMimeType()));
+			 * header("Location: " . \OC::$server->getMimeTypeDetector()->mimeTypeIcon($i->getMimeType()));
 			 */
 		}
         }