diff --git a/apps/chat.js b/apps/chat.js
index 4298395..0611825 100644
--- a/apps/chat.js
+++ b/apps/chat.js
@@ -739,7 +739,7 @@ export class chatgpt extends plugin {
         })
       }
       if (useTTS) {
-        if (Config.ttsSpace && response.length <= 299) {
+        if (Config.ttsSpace && response.length <= Config.ttsAutoFallbackThreshold) {
           let wav = await generateAudio(response, speaker, '中日混合（中文用[ZH][ZH]包裹起来，日文用[JA][JA]包裹起来）')
           await e.reply(segment.record(wav))
           if (Config.alsoSendText) {