diff --git a/ontology/saref4inma.ttl b/ontology/saref4inma.ttl
index d0e3ca36270b511c37d902bb5ebd31b292d95766..2d1e13e15d1464391a45439fc9c9da7ce9c6111b 100644
--- a/ontology/saref4inma.ttl
+++ b/ontology/saref4inma.ttl
@@ -11,6 +11,7 @@
 
 <https://saref.etsi.org/saref4inma/> rdf:type owl:Ontology ;
                                       owl:versionIRI <https://saref.etsi.org/saref4inma/v2.1.1/> ;
+                                      owl:imports <https://saref.etsi.org/core/v3.2.1/> ;
                                       <http://purl.org/dc/terms/contributor> <http://purl.org/net/mpoveda> ,
                                                                              <https://www.linkedin.com/in/matthijs-punter-0799902> ;
                                       <http://purl.org/dc/terms/created> "2015-03-29"^^xsd:date ;