diff --git "a/ontology/termit-glos\303\241\305\231.ttl" "b/ontology/termit-glos\303\241\305\231.ttl"
index f32e1e84b..2dd198c79 100644
--- "a/ontology/termit-glos\303\241\305\231.ttl"
+++ "b/ontology/termit-glos\303\241\305\231.ttl"
@@ -5,6 +5,10 @@
 @prefix termit-pojem: <http://onto.fel.cvut.cz/ontologies/application/termit/pojem/> .
 @prefix rdfs:  <http://www.w3.org/2000/01/rdf-schema#> .
 
+<http://www.w3.org/ns/activitystreams#>
+        <http://purl.org/vocab/vann/preferredNamespacePrefix>
+            "as" .
+
 termit-pojem:cíl-definičního-výskytu
         a       <http://www.w3.org/2004/02/skos/core#Concept> ;
         <http://www.w3.org/2004/02/skos/core#broader>
diff --git a/src/main/java/cz/cvut/kbss/termit/dto/AggregatedChangeInfo.java b/src/main/java/cz/cvut/kbss/termit/dto/AggregatedChangeInfo.java
index c07bc314f..05022fb6b 100644
--- a/src/main/java/cz/cvut/kbss/termit/dto/AggregatedChangeInfo.java
+++ b/src/main/java/cz/cvut/kbss/termit/dto/AggregatedChangeInfo.java
@@ -47,7 +47,7 @@ public class AggregatedChangeInfo implements HasTypes, Comparable<AggregatedChan
     /**
      * Number of distinct changed assets
      */
-    @OWLDataProperty(iri = Vocabulary.s_p_totalItems)
+    @OWLDataProperty(iri = Vocabulary.s_p_as_totalItems)
     private Integer count;
 
     @Types
diff --git a/src/main/java/cz/cvut/kbss/termit/model/comment/CommentReaction.java b/src/main/java/cz/cvut/kbss/termit/model/comment/CommentReaction.java
index 58daae680..f692be575 100644
--- a/src/main/java/cz/cvut/kbss/termit/model/comment/CommentReaction.java
+++ b/src/main/java/cz/cvut/kbss/termit/model/comment/CommentReaction.java
@@ -34,11 +34,11 @@
 public class CommentReaction extends AbstractEntity implements HasTypes {
 
     @ParticipationConstraints(nonEmpty = true)
-    @OWLObjectProperty(iri = Vocabulary.s_p_actor)
+    @OWLObjectProperty(iri = Vocabulary.s_p_as_actor)
     private URI actor;
 
     @ParticipationConstraints(nonEmpty = true)
-    @OWLObjectProperty(iri = Vocabulary.s_p_object)
+    @OWLObjectProperty(iri = Vocabulary.s_p_as_object)
     private URI object;
 
     @ParticipationConstraints(nonEmpty = true)