diff --git a/bookshop/srv/admin-service.js b/bookshop/srv/admin-service.js
index 0cdae4d8..7a5d5804 100644
--- a/bookshop/srv/admin-service.js
+++ b/bookshop/srv/admin-service.js
@@ -1,9 +1,10 @@
-const cds = require('@sap/cds')
+const cds = require('@sap/cds/lib')
 
-module.exports = cds.service.impl (function(){
+module.exports = class AdminService extends cds.ApplicationService { init(){
   this.before ('NEW','Authors', genid)
   this.before ('NEW','Books', genid)
-})
+  return super.init()
+}}
 
 /** Generate primary keys for target entity in request */
 async function genid (req) {