diff --git a/python/packages/autogen-ext/src/autogen_ext/runtimes/grpc/_worker_runtime.py b/python/packages/autogen-ext/src/autogen_ext/runtimes/grpc/_worker_runtime.py
index a4afb647641f..7e5e9e734dd0 100644
--- a/python/packages/autogen-ext/src/autogen_ext/runtimes/grpc/_worker_runtime.py
+++ b/python/packages/autogen-ext/src/autogen_ext/runtimes/grpc/_worker_runtime.py
@@ -3,6 +3,7 @@
 import json
 import logging
 import signal
+import sys
 import uuid
 import warnings
 from asyncio import Future, Task
@@ -309,6 +310,10 @@ async def stop_when_shutdown(self) -> None:
 
     async def stop_when_signal(self, signals: Sequence[signal.Signals] = (signal.SIGTERM, signal.SIGINT)) -> None:
         """Stop the runtime when a signal is received."""
+
+        # check if it's running on linux or windows
+        if sys.platform == "win32":
+            raise NotImplementedError("Signal handling is not supported on Windows. Please use stop_when_shutdown instead.")
         loop = asyncio.get_running_loop()
         shutdown_event = asyncio.Event()