diff --git a/tests/test_litellm/proxy/client/cli/autoroute/test_process.py b/tests/test_litellm/proxy/client/cli/autoroute/test_process.py
index 5451464b74e..1b8c32589ea 100644
--- a/tests/test_litellm/proxy/client/cli/autoroute/test_process.py
+++ b/tests/test_litellm/proxy/client/cli/autoroute/test_process.py
@@ -253,7 +253,7 @@ class TestWindowsPidExists:
             last_error=Mock(return_value=0),
         )
 
-        with pytest.raises(OSError):
+        with pytest.raises(OSError, match="Invalid argument"):
             _windows_pid_exists(4321, api)
 
         close_handle.assert_called_once_with(99)