diff --git a/ontology/saref4wear.ttl b/ontology/saref4wear.ttl
index 02d47b135753e90bd4eb29527a5f737c2220bc2e..53afce16229ae117c463abc28936f2f9c41d2f4b 100644
--- a/ontology/saref4wear.ttl
+++ b/ontology/saref4wear.ttl
@@ -10,7 +10,7 @@
 @prefix voaf: <http://purl.org/vocommons/voaf#> .
 @prefix geo: <http://www.w3.org/2003/01/geo/wgs84_pos#> .
 @prefix geosp: <http://www.opengis.net/ont/geosparql#> .
-@prefix saref: <https://w3id.org/saref#> .
+@prefix saref: <https://saref.etsi.org/saref#> .
 @prefix s4city: <https://saref.etsi.org/saref4city#> .
 @prefix s4wear: <https://saref.etsi.org/s4wear#> .
 @prefix dcterms: <http://purl.org/dc/terms/> .