diff --git a/src/services/sessionService.js b/src/services/sessionService.js
index ea0cc18..a032f1b 100644
--- a/src/services/sessionService.js
+++ b/src/services/sessionService.js
@@ -1,7 +1,5 @@
 const uuid = require('uuid');
 
-const models = require('../models');
-
 const constants = require('../constants');
 
 class SessionServiceProvider {
@@ -77,9 +75,9 @@ class SessionServiceProvider {
       return false;
     };
 
-    async function getPublicKeyRelatedToSession(sessionUuid) {
+    const getPublicKeyRelatedToSession = async (sessionUuid) => {
       const sessionRelatedToPublickey =
-        await models.SessionRelatedToPublickey.findOne({
+        await this.models.SessionRelatedToPublickey.findOne({
           where: {
             session_uuid: sessionUuid,
           },
@@ -90,7 +88,7 @@ class SessionServiceProvider {
       }
 
       return null;
-    }
+    };
 
     return {
       createSession,