diff --git a/public/instance/catalog.rdf b/public/instance/catalog.rdf
index 36348b7abcc105be5be73626be905e7f23f69842..e34e45ced847bf67dcb687cd1c8814d5f6d7cf0e 100644
--- a/public/instance/catalog.rdf
+++ b/public/instance/catalog.rdf
@@ -14,7 +14,8 @@
       </org:FormalOrganization>
     </dct:publisher>
     <dct:license>
-      <dct:LicenseDocument rdf:about="http://creativecommons.org/publicdomain/zero/1.0/">
+      <dct:LicenseDocument>
+        <owl:sameAs rdf:resource="http://creativecommons.org/publicdomain/zero/1.0/"/>
         <skos:prefLabel>CC0 1.0 Universal</skos:prefLabel>
       </dct:LicenseDocument>
     </dct:license>