diff --git a/CHANGELOG.md b/CHANGELOG.md
index 217474f5f..38683ec4b 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -52,6 +52,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- Fixed a `CartesiaTTSService` issue that could cause audio overlapping in some
+  cases.
+
 - Fixed an issue that was causing `AudioBufferProcessor` to not record
   synchronized audio.
 
diff --git a/src/pipecat/services/cartesia.py b/src/pipecat/services/cartesia.py
index d5ea46a30..3a0f9936e 100644
--- a/src/pipecat/services/cartesia.py
+++ b/src/pipecat/services/cartesia.py
@@ -239,6 +239,7 @@ class CartesiaTTSService(WordTTSService, WebsocketService):
         logger.trace(f"{self}: flushing audio")
         msg = self._build_msg(text="", continue_transcript=False)
         await self._websocket.send(msg)
+        self._context_id = None
 
     async def _receive_messages(self):
         async for message in self._get_websocket():