diff --git a/changelog/3959.fixed.md b/changelog/3959.fixed.md
new file mode 100644
index 000000000..a10521d92
--- /dev/null
+++ b/changelog/3959.fixed.md
@@ -0,0 +1 @@
+- Fixed `on_call_state_updated` event handler in LiveKit transport receiving incorrect number of arguments due to redundant `self` passed to `_call_event_handler`.
diff --git a/src/pipecat/transports/livekit/transport.py b/src/pipecat/transports/livekit/transport.py
index 7e9c1de35..3fb3d1694 100644
--- a/src/pipecat/transports/livekit/transport.py
+++ b/src/pipecat/transports/livekit/transport.py
@@ -1244,7 +1244,7 @@ class LiveKitTransport(BaseTransport):
 
     async def _on_call_state_updated(self, state: str):
         """Handle call state update events."""
-        await self._call_event_handler("on_call_state_updated", self, state)
+        await self._call_event_handler("on_call_state_updated", state)
 
     async def _on_first_participant_joined(self, participant_id: str):
         """Handle first participant joined events."""