diff --git a/src/openflexure_microscope_server/things/scan_workflows.py b/src/openflexure_microscope_server/things/scan_workflows.py
index 952b9dcb..fe4ee898 100644
--- a/src/openflexure_microscope_server/things/scan_workflows.py
+++ b/src/openflexure_microscope_server/things/scan_workflows.py
@@ -329,8 +329,6 @@ class SmartStackCompatibleSettings(Protocol):
 class SmartStackMixin:
     """A mixin for scan workflows that use smart stacking."""
 
-    _class_settings = {"validate_properties_on_set": True}
-
     stack_images_to_save: int = lt.setting(default=1, ge=1, le=9)
     """The number of images to save in a stack.