diff --git a/invenio_rdm_records/resources/config.py b/invenio_rdm_records/resources/config.py
index 4e7bc32c6f..deaa86c9ee 100644
--- a/invenio_rdm_records/resources/config.py
+++ b/invenio_rdm_records/resources/config.py
@@ -95,7 +95,8 @@ def _bibliography_headers(obj_or_list, code, many=False):
                 "metadata.creators.person_or_org.type",
                 "metadata.creators.person_or_org.name",
                 "metadata.rights.id",
-            ]
+            ],
+            collapse_lists=True,
         )
     ),
     "application/marcxml+xml": ResponseHandler(