diff --git a/custom_components/openclaw/conversation.py b/custom_components/openclaw/conversation.py
index 6baa134..4210c3b 100644
--- a/custom_components/openclaw/conversation.py
+++ b/custom_components/openclaw/conversation.py
@@ -43,6 +43,7 @@
 _VOICE_REQUEST_HEADERS = {
     "x-openclaw-source": "voice",
     "x-ha-voice": "true",
+    "x-openclaw-message-channel": "voice",
 }