diff --git a/example/src/__mocks__/react-native-i18n.js b/example/src/__mocks__/react-native-i18n.js
index 3c25f56..c2b0831 100644
--- a/example/src/__mocks__/react-native-i18n.js
+++ b/example/src/__mocks__/react-native-i18n.js
@@ -3,5 +3,5 @@
 import I18nJs from 'i18n-js';
 
 I18nJs.locale = 'en'; // a locale from your available translations
-export const getLanguages = () => Promise.resolve(['en']);
+export const getLanguages = (): Promise<string[]> => Promise.resolve(['en']);
 export default I18nJs;