diff --git a/packages/text-to-speech/src/index.ts b/packages/text-to-speech/src/index.ts
index 064e90411..a933a940e 100644
--- a/packages/text-to-speech/src/index.ts
+++ b/packages/text-to-speech/src/index.ts
@@ -238,8 +238,8 @@ export const textToSpeechStreamingHandler = Sentry.GCPFunction.wrapHttpFunction(
     // create redis source
     const redisDataSource = new RedisDataSource({
       cache: {
-        url: process.env.REDIS_URL,
-        cert: process.env.REDIS_CERT,
+        url: process.env.REDIS_TTS_URL,
+        cert: process.env.REDIS_TTS_CERT,
       },
       mq: {
         url: process.env.MQ_REDIS_URL,