diff --git a/ontology/saref4agri.ttl b/ontology/saref4agri.ttl
index 36382eeb4f4114d153f0fc2a64502f4ed9c86728..cd998b85b72701bd9642f7cc6d49ca8b97b40356 100644
--- a/ontology/saref4agri.ttl
+++ b/ontology/saref4agri.ttl
@@ -49,6 +49,7 @@ dcterms:contributor rdf:type owl:AnnotationProperty .
 ###  http://purl.org/dc/terms/created
 dcterms:created rdf:type owl:AnnotationProperty .
 
+wgs84:SpatialThing a owl:Class .
 foaf:Organization a owl:Class ; rdfs:isDefinedBy foaf: .
 foaf:Person a owl:Class ; rdfs:isDefinedBy foaf: .