diff --git a/src/pipecat/services/cartesia.py b/src/pipecat/services/cartesia.py
index ad4636a74..f92a78aa4 100644
--- a/src/pipecat/services/cartesia.py
+++ b/src/pipecat/services/cartesia.py
@@ -210,6 +210,8 @@ class CartesiaTTSService(WordTTSService):
     async def _handle_interruption(self, frame: StartInterruptionFrame, direction: FrameDirection):
         await super()._handle_interruption(frame, direction)
         await self.stop_all_metrics()
+        cancel_msg = json.dumps({"context_id": self._context_id, "cancel": True})
+        await self._get_websocket().send(cancel_msg)
         self._context_id = None
 
     async def flush_audio(self):