diff --git a/modules/sub/loc.js b/modules/sub/loc.js
index a178746..d8dc010 100644
--- a/modules/sub/loc.js
+++ b/modules/sub/loc.js
@@ -2,7 +2,7 @@ import { supportedLanguages, appName } from "../config.js";
 import loadJson from "./load-json.js";
 
 export default function(lang, cat, string, replacement) {
-    if (!lang in supportedLanguages) {
+    if (!supportedLanguages.includes(lang)) {
         lang = 'en'
     }
     try {
@@ -19,4 +19,4 @@ export default function(lang, cat, string, replacement) {
     } catch (e) {
         return string
     }
-}
\ No newline at end of file
+}