diff --git a/tests/components/plex/helpers.py b/tests/components/plex/helpers.py
index 00d0a4539c1..4828b972d9d 100644
--- a/tests/components/plex/helpers.py
+++ b/tests/components/plex/helpers.py
@@ -1,9 +1,11 @@
 """Helper methods for Plex tests."""
 
 from datetime import timedelta
+from typing import Any
 
 from plexwebsocket import SIGNAL_CONNECTION_STATE, STATE_CONNECTED
 
+from homeassistant.helpers.typing import UNDEFINED, UndefinedType
 import homeassistant.util.dt as dt_util
 
 from tests.common import async_fire_time_changed
@@ -27,10 +29,14 @@ def websocket_connected(mock_websocket):
     callback(SIGNAL_CONNECTION_STATE, STATE_CONNECTED, None)
 
 
-def trigger_plex_update(mock_websocket, msgtype="playing", payload=UPDATE_PAYLOAD):
+def trigger_plex_update(
+    mock_websocket,
+    msgtype="playing",
+    payload: dict[str, Any] | UndefinedType = UNDEFINED,
+):
     """Call the websocket callback method with a Plex update."""
     callback = mock_websocket.call_args[0][1]
-    callback(msgtype, payload, None)
+    callback(msgtype, UPDATE_PAYLOAD if payload is UNDEFINED else payload, None)
 
 
 async def wait_for_debouncer(hass):