diff --git a/openflexure_microscope/api/v1/blueprints/base.py b/openflexure_microscope/api/v1/blueprints/base.py
index 24681f0d..924d7631 100644
--- a/openflexure_microscope/api/v1/blueprints/base.py
+++ b/openflexure_microscope/api/v1/blueprints/base.py
@@ -207,7 +207,7 @@ class ConfigAPI(MicroscopeView):
 
         logging.debug("Updating settings from POST request.")
 
-        self.microscope.write_config(payload.json)
+        self.microscope.apply_config(payload.json)
         self.microscope.save_config()
 
         return jsonify(self.microscope.read_config(json_safe=True))