diff --git a/app/constant.ts b/app/constant.ts
index f34d407c1..f3b1c5035 100644
--- a/app/constant.ts
+++ b/app/constant.ts
@@ -292,7 +292,7 @@ export const KnowledgeCutOffDate: Record<string, string> = {
 };
 
 export const DEFAULT_TTS_ENGINE = "Edge-TTS";
-export const DEFAULT_TTS_ENGINES = ["Edge-TTS", "OpenAI-TTS"];
+export const DEFAULT_TTS_ENGINES = "Edge-TTS";
 export const DEFAULT_TTS_MODEL = "tts-1";
 export const DEFAULT_TTS_VOICE = "alloy";
 export const DEFAULT_TTS_MODELS = ["tts-1", "tts-1-hd"];