diff --git a/sib-chat.js b/sib-chat.js
index cf5a26049d01154a0e018300e2687dd3f8dbf919..fe1f7c899f298f473a6204f4e1c690ead856068c 100644
--- a/sib-chat.js
+++ b/sib-chat.js
@@ -5,6 +5,7 @@ import { Sib } from "https://unpkg.com/@startinblox/core@0.9/dist/libs/Sib.js";
 import { StoreMixin } from 'https://unpkg.com/@startinblox/core@0.9/dist/mixins/storeMixin.js';
 
 Helpers.importCSS('https://unpkg.com/converse.js@4.2/css/fonts.css');
+const jabberIDContext = { "foaf": 'http://xmlns.com/foaf/0.1/', "chatProfile": "http://happy-dev.fr/owl/#chatProfile", "jabberID": "foaf:jabberID" };
 
 class Deferred {
   constructor() {
@@ -64,8 +65,8 @@ export const SibChat = {
       if (await this.resource.jabberRoom) {
         this.jid = (await this.resource['foaf:jabberID']).toString();
       } else {
-        await store.initGraph(this.resource['@id'], {"jabberID": "foaf:jabberID"});
-        this.jid = (await (store.get(this.resource['@id'])['chatProfile.jabberID'])).toString();
+        await store.initGraph(this.resource['@id'], jabberIDContext);
+        this.jid = await (store.get(this.resource['@id'])['chatProfile.jabberID']);
       }
       await converse_sib.connected_deferred
       converse_sib.service.plugins.sibChat.changeChat(
@@ -174,15 +175,14 @@ export const SibChat = {
     });
 
     let user = await document.querySelector('sib-auth').getUser();
-    await store.initGraph(user['@id'], {"jabberID": "foaf:jabberID"});
-    const jabberID = (await (store.get(user['@id'])['chatProfile.jabberID'])).toString();
-    
+    await store.initGraph(user['@id'], jabberIDContext);
+    const jabberID = await (store.get(user['@id'])['chatProfile.jabberID']);
 
     if(this.resource) {
       if (await this.resource.jabberRoom) {
         this.jid = (await this.resource['foaf:jabberID']).toString();
       } else {
-        await store.initGraph(this.resource['@id'], {"jabberID": "foaf:jabberID"});
+        await store.initGraph(this.resource['@id'], jabberIDContext);
         this.jid = (await (store.get(this.resource['@id'])['chatProfile.jabberID'])).toString();
       }
     } else {