diff --git a/src/openflexure_microscope_server/things/smart_scan.py b/src/openflexure_microscope_server/things/smart_scan.py
index 9195b344..939abc1f 100644
--- a/src/openflexure_microscope_server/things/smart_scan.py
+++ b/src/openflexure_microscope_server/things/smart_scan.py
@@ -186,6 +186,7 @@ class SmartScanThing(Thing):
             # record starting position so we can return there
             self._starting_position = self._stage.position
             self._run_scan()
+            self._update_scan_inputs_json()
         except Exception as e:
             # If _scan_data is set then scan started
             if self._scan_data is not None: