diff --git a/scanslicer/ui_builders_controls.py b/scanslicer/ui_builders_controls.py
index 39c8217..efdeeed 100644
--- a/scanslicer/ui_builders_controls.py
+++ b/scanslicer/ui_builders_controls.py
@@ -245,3 +245,6 @@ class ScanSlicerUiControlsMixin(ScanSlicerUiSharedMixin):
         controls_scroll.setFixedWidth(self.CONTROL_PANEL_WIDTH)
         controls_scroll.setHorizontalScrollBarPolicy(Qt.ScrollBarAlwaysOff)
         return controls_scroll
+
+
+__all__ = ["ScanSlicerUiControlsMixin"]