diff --git a/ontology/saref4lift.ttl b/ontology/saref4lift.ttl
index afb76f1af87f5b8c6079fdd6c69bcc653f6af1cf..c51be5bffa16309099a4b13d2f392b2ffb2f11b5 100644
--- a/ontology/saref4lift.ttl
+++ b/ontology/saref4lift.ttl
@@ -476,19 +476,19 @@ s4lift:AlarmVoiceCommunicationState rdf:type owl:Class ;
 
 ###  https://saref.etsi.org/saref4lift/AlarmInTheWellState
 s4lift:AlarmInTheWellState rdf:type owl:Class ;
-  rdfs:subClassOf saref:AlarmState ;
+  rdfs:subClassOf s4lift:AlarmState ;
   rdfs:label "Alarm in the well state"@en ;
   rdfs:comment "State of a device when the alarm in the well has been activated."@en .
 
 ###  https://saref.etsi.org/saref4lift/AlarmInTheRoofState
 s4lift:AlarmInTheRoofState rdf:type owl:Class ;
-  rdfs:subClassOf saref:AlarmState ;
+  rdfs:subClassOf s4lift:AlarmState ;
   rdfs:label "Alarm in the roof state"@en ;
   rdfs:comment "State of a device when the alarm in the roof has been activated."@en .
 
 ###  https://saref.etsi.org/saref4lift/AlarmInTheMachineryState
 s4lift:AlarmInTheMachineryState rdf:type owl:Class ;
-  rdfs:subClassOf saref:AlarmState ;
+  rdfs:subClassOf s4lift:AlarmState ;
   rdfs:label "Alarm in the machinery state"@en ;
   rdfs:comment "State of a device when the alarm in the machinery has been activated."@en .
 
@@ -553,7 +553,7 @@ s4lift:PassengerAndGoodsPassengerSmartLift rdf:type owl:Class ;
 
 ###  https://saref.etsi.org/saref4lift/FloodInTheWellState
 s4lift:FloodInTheWellState rdf:type owl:Class ;
-  rdfs:subClassOf saref:AlarmState ;
+  rdfs:subClassOf s4lift:AlarmState ;
   rdfs:label "Flood in the well state"@en ;
   rdfs:comment "The state of a lift where a flood is detected in the well."@en .