diff --git a/openflexure_microscope/camera/pi.py b/openflexure_microscope/camera/pi.py
index 401f0012..4a51ed3d 100644
--- a/openflexure_microscope/camera/pi.py
+++ b/openflexure_microscope/camera/pi.py
@@ -131,7 +131,7 @@ class StreamingCamera(BaseCamera):
         }
 
         # PiCamera parameters (obtained directly from PiCamera object)
-        for key, _ in self.config['picamera_settings'].items():
+        for key, _ in CONFIG_KEYS['picamera_settings'].items():
             try:
                 value = getattr(self.camera, key)
                 conf_dict['picamera_settings'][key] = value