diff --git a/src/models/PhoneDnis.js b/src/models/PhoneDnis.js
index d5c9ccc40..7e21da4ae 100644
--- a/src/models/PhoneDnis.js
+++ b/src/models/PhoneDnis.js
@@ -1,3 +1,4 @@
+// @flow
 import moment from 'moment';
 import { parsePhoneNumberFromString } from 'libphonenumber-js';
 import CCUModel from '@/models/model';