diff --git a/libs/ui/include/psemek/ui/single_container.hpp b/libs/ui/include/psemek/ui/single_container.hpp
index 3a75758d..10a56bfb 100644
--- a/libs/ui/include/psemek/ui/single_container.hpp
+++ b/libs/ui/include/psemek/ui/single_container.hpp
@@ -11,7 +11,7 @@ namespace psemek::ui
 		children_range children() const override { return children_; }
 
 		virtual std::shared_ptr<element> set_child(std::shared_ptr<element> c);
-		virtual std::shared_ptr<element> child() { return child_; }
+		virtual std::shared_ptr<element> child() const { return child_; }
 
 		~single_container() override;