diff --git a/config/resources/domain.json b/config/resources/domain.json
index 3e8db7e..1bc4628 100644
--- a/config/resources/domain.json
+++ b/config/resources/domain.json
@@ -374,7 +374,7 @@
           "predicate": "skos:prefLabel"
         },
         "alternative-name": {
-          "type": "string",
+          "type": "string-set",
           "predicate": "skos:altLabel"
         },
         "legal-name": {