diff --git a/src/LanguageFunctionPatcher.ts b/src/LanguageFunctionPatcher.ts
index a3a4696f..a27756dd 100644
--- a/src/LanguageFunctionPatcher.ts
+++ b/src/LanguageFunctionPatcher.ts
@@ -10,7 +10,7 @@ import { getPref } from "./StoragePreferences";
 export const LanguageFunctionPatcher = (): void => {
 	if (typeof TD !== "undefined" && typeof TD.languages !== "undefined") {
 		TD.languages.getSystemLanguageCode = (e): string => {
-            var t = getPref("mtd_lang").replace("_","-").substr(0,2);
+            var t = getPref("mtd_lang", "en_US").replace("_","-").substr(0,2);
             return e && (t = t.replace(/-[a-z]+$/i, "")),
             t
         }