diff --git a/tests/adapter/matrix/test_dispatcher.py b/tests/adapter/matrix/test_dispatcher.py
index 7fa7a47..f338495 100644
--- a/tests/adapter/matrix/test_dispatcher.py
+++ b/tests/adapter/matrix/test_dispatcher.py
@@ -276,7 +276,7 @@ async def test_bot_assigns_platform_chat_id_for_existing_managed_room():
     runtime.dispatcher.dispatch.assert_awaited_once()
 
 
-async def test_bot_routes_plain_messages_via_platform_chat_id():
+async def test_bot_keeps_local_chat_id_for_plain_messages():
     runtime = build_runtime(platform=MockPlatformClient())
     await set_room_meta(
         runtime.store,
@@ -297,7 +297,7 @@ async def test_bot_routes_plain_messages_via_platform_chat_id():
     await bot.on_room_message(room, event)
 
     dispatched = runtime.dispatcher.dispatch.await_args.args[0]
-    assert dispatched.chat_id == "41"
+    assert dispatched.chat_id == "C1"
     assert dispatched.text == "hello"