diff --git a/Koha/REST/V1/Biblios.pm b/Koha/REST/V1/Biblios.pm
index c8d220e6da..61332553a1 100644
--- a/Koha/REST/V1/Biblios.pm
+++ b/Koha/REST/V1/Biblios.pm
@@ -619,7 +619,7 @@ sub list {
         if ( $c->req->headers->accept =~ m/application\/json(;.*)?$/ ) {
             return $c->render(
                 status => 200,
-                json   => $biblios->to_api
+                json   => $c->objects->to_api( $biblios ),
             );
         }
         elsif (