diff --git a/src/tts/tts.ts b/src/tts/tts.ts
index 17a7c2fc981..348ff94be91 100644
--- a/src/tts/tts.ts
+++ b/src/tts/tts.ts
@@ -825,6 +825,10 @@ export async function maybeApplyTtsToPayload(params: {
   inboundAudio?: boolean;
   ttsAuto?: string;
 }): Promise<ReplyPayload> {
+  // Compaction notices are informational UI signals — never synthesise them as speech.
+  if (params.payload.isCompactionNotice) {
+    return params.payload;
+  }
   const config = resolveTtsConfig(params.cfg);
   const prefsPath = resolveTtsPrefsPath(config);
   const autoMode = resolveTtsAutoMode({