diff --git a/core/duplex_pipeline.py b/core/duplex_pipeline.py
index 8a0211f..ec67d4b 100644
--- a/core/duplex_pipeline.py
+++ b/core/duplex_pipeline.py
@@ -388,6 +388,8 @@ class DuplexPipeline:
         self._last_sent_transcript = ""
         
         # Process the turn - trigger LLM response
+        # Cancel any existing turn to avoid overlapping assistant responses
+        await self._stop_current_speech()
         await self.conversation.end_user_turn(user_text)
         self._current_turn_task = asyncio.create_task(self._handle_turn(user_text))