1 files changed, 1 insertions, 1 deletions
diff --git a/xfa/fwl/cfwl_checkbox.h b/xfa/fwl/cfwl_checkbox.h
index 9ae6590b2f..f2413aaca7 100644
--- a/xfa/fwl/cfwl_checkbox.h
+++ b/xfa/fwl/cfwl_checkbox.h
@@ -33,7 +33,7 @@ class CFWL_MessageMouse;
 class CFWL_WidgetProperties;
 class CFWL_Widget;
 
-class CFWL_CheckBox : public CFWL_Widget {
+class CFWL_CheckBox final : public CFWL_Widget {
  public:
   explicit CFWL_CheckBox(const CFWL_App* pApp);
   ~CFWL_CheckBox() override;