diff --git a/api/src/core/api.js b/api/src/core/api.js
index 9532be81..975e7da9 100644
--- a/api/src/core/api.js
+++ b/api/src/core/api.js
@@ -9,7 +9,6 @@ import match from "../processing/match.js";
 
 import { env } from "../config.js";
 import { extract } from "../processing/url.js";
-import { languageCode } from "../misc/utils.js";
 import { Bright, Cyan } from "../misc/console-text.js";
 import { generateHmac, generateSalt } from "../misc/crypto.js";
 import { randomizeCiphers } from "../misc/randomize-ciphers.js";
@@ -222,16 +221,11 @@ export const runAPI = (express, app, __dirname) => {
 
     app.post('/', async (req, res) => {
         const request = req.body;
-        const lang = languageCode(req);
 
         if (!request.url) {
             return fail(res, "error.api.link.missing");
         }
 
-        if (request.youtubeDubBrowserLang) {
-            request.youtubeDubLang = lang;
-        }
-
         const { success, data: normalizedRequest } = await normalizeRequest(request);
         if (!success) {
             return fail(res, "error.api.invalid_body");
diff --git a/api/src/processing/schema.js b/api/src/processing/schema.js
index f7493325..48d8b058 100644
--- a/api/src/processing/schema.js
+++ b/api/src/processing/schema.js
@@ -1,7 +1,5 @@
 import { z } from "zod";
-
 import { normalizeURL } from "./url.js";
-import { verifyLanguageCode } from "../misc/utils.js";
 
 export const apiSchema = z.object({
     url: z.string()
@@ -33,17 +31,21 @@ export const apiSchema = z.object({
     ).default("1080"),
 
     youtubeDubLang: z.string()
-                     .length(2)
-                     .transform(verifyLanguageCode)
+                     .min(2)
+                     .max(8)
+                     .regex(/^[0-9a-zA-Z\-]+$/)
                      .optional(),
 
+    // TODO: remove this variable as it's no longer used
+    // and is kept for schema compatibility reasons
+    youtubeDubBrowserLang: z.boolean().default(false),
+
     alwaysProxy: z.boolean().default(false),
     disableMetadata: z.boolean().default(false),
     tiktokFullAudio: z.boolean().default(false),
     tiktokH265: z.boolean().default(false),
     twitterGif: z.boolean().default(true),
 
-    youtubeDubBrowserLang: z.boolean().default(false),
     youtubeHLS: z.boolean().default(false),
 })
 .strict();