diff --git a/data/ontologies/digital-heraldry-ontology-representation.ttl b/data/ontologies/digital-heraldry-ontology-representation.ttl
index a4f46d12dc75693e868537afac65a0db158f8a94..3c0d89ae71afab94ce7f0240d9a3424c3612735d 100644
--- a/data/ontologies/digital-heraldry-ontology-representation.ttl
+++ b/data/ontologies/digital-heraldry-ontology-representation.ttl
@@ -310,6 +310,7 @@ dhor:hasItemID rdf:type owl:DatatypeProperty ;
 
 ###  http://digitalheraldry.org/digital-heraldry-ontology/representation#hasOMAArmCode
 dhor:hasOMAArmCode rdf:type owl:DatatypeProperty ;
+                   rdfs:range rdfs:Literal ;
                    rdfs:comment "Legacy ArmCode from OMA"@en ;
                    rdfs:label "hasOMAArmCode"@en .