diff --git a/ontology/saref4ehaw.ttl b/ontology/saref4ehaw.ttl
index 2d76f9230d6fe74354db04b96c06e70fb1df9cb9..09cedc39170c9da65c3b09657e7844f817026bbb 100644
--- a/ontology/saref4ehaw.ttl
+++ b/ontology/saref4ehaw.ttl
@@ -8,7 +8,6 @@
 @prefix saref: <https://saref.etsi.org/saref/core/> .
 @prefix s4ehaw: <https://saref.etsi.org/saref4ehaw/> .
 @prefix s4envi: <https://saref.etsi.org/saref4envi/> .
-@prefix s4wear: <https://saref.etsi.org/saref4wear/> .
 @prefix ssn-system: <http://www.w3.org/ns/ssn/systems/> .
 @prefix dcterms: <http://purl.org/dc/terms/> .
 @base <https://saref.etsi.org/saref4ehaw/> .