diff --git a/src/openflexure_microscope_server/things/camera/picamera.py b/src/openflexure_microscope_server/things/camera/picamera.py
index a6b851c9..79c19c1f 100644
--- a/src/openflexure_microscope_server/things/camera/picamera.py
+++ b/src/openflexure_microscope_server/things/camera/picamera.py
@@ -1094,8 +1094,9 @@ class StreamingPiCamera2(BaseCamera):
         """
         return tf_utils.lst_is_static(self.tuning)
 
-    def get_thing_state(self) -> Mapping[str, Any]:
+    @property
+    def thing_state(self) -> Mapping[str, Any]:
         """Update generic camera metadata with Picamera-specific data."""
-        state = super().get_thing_state()
+        state = super().thing_state
         state["camera_board"] = self._camera_board
         return state