diff --git a/frigate/camera/state.py b/frigate/camera/state.py
index 9d9e3aac4..328c7bd23 100644
--- a/frigate/camera/state.py
+++ b/frigate/camera/state.py
@@ -272,7 +272,7 @@ class CameraState:
     def finished(self, obj_id):
         del self.tracked_objects[obj_id]
 
-    def on(self, event_type: str, callback: Callable[[str, TrackedObject, str], None]):
+    def on(self, event_type: str, callback: Callable):
         self.callbacks[event_type].append(callback)
 
     def update(