diff --git a/libs/ui/include/psemek/ui/element.hpp b/libs/ui/include/psemek/ui/element.hpp
index 5b76f2ba..748abdf5 100644
--- a/libs/ui/include/psemek/ui/element.hpp
+++ b/libs/ui/include/psemek/ui/element.hpp
@@ -70,8 +70,8 @@ namespace psemek::ui
 		virtual std::shared_ptr<struct style const> set_style(std::shared_ptr<struct style const> st);
 		virtual std::shared_ptr<struct style const> set_own_style(std::shared_ptr<struct style const> st);
 
-		virtual void style_updated();
-		virtual void own_style_updated();
+		virtual void style_updated() const;
+		virtual void own_style_updated() const;
 
 		virtual std::optional<std::string> const & hint() const { return hint_; }
 		virtual std::optional<std::string> set_hint(std::optional<std::string> hint);
diff --git a/libs/ui/include/psemek/ui/label.hpp b/libs/ui/include/psemek/ui/label.hpp
index 143773e7..1c866f06 100644
--- a/libs/ui/include/psemek/ui/label.hpp
+++ b/libs/ui/include/psemek/ui/label.hpp
@@ -72,8 +72,8 @@ namespace psemek::ui
 		geom::interval<float> width_constraints(float height) const override;
 		geom::interval<float> height_constraints(float width) const override;
 
-		void style_updated() override;
-		void own_style_updated() override;
+		void style_updated() const override;
+		void own_style_updated() const override;
 
 		bool transparent() const override { return !hint(); }
 
diff --git a/libs/ui/source/element.cpp b/libs/ui/source/element.cpp
index 22e862fa..5f8cee7f 100644
--- a/libs/ui/source/element.cpp
+++ b/libs/ui/source/element.cpp
@@ -101,7 +101,7 @@ namespace psemek::ui
 		return st;
 	}
 
-	void element::style_updated()
+	void element::style_updated() const
 	{
 		merged_style_ = nullptr;
 		own_style_updated();
@@ -109,7 +109,7 @@ namespace psemek::ui
 			if (c) c->style_updated();
 	}
 
-	void element::own_style_updated()
+	void element::own_style_updated() const
 	{
 		merged_own_style_ = nullptr;
 	}
diff --git a/libs/ui/source/label.cpp b/libs/ui/source/label.cpp
index 6a2b41ae..e3c85cd9 100644
--- a/libs/ui/source/label.cpp
+++ b/libs/ui/source/label.cpp
@@ -84,14 +84,14 @@ namespace psemek::ui
 		return {state.size[1], inf};
 	}
 
-	void label::style_updated()
+	void label::style_updated()  const
 	{
 		element::style_updated();
 		cached_state_.reset();
 		cached_state_inf_.reset();
 	}
 
-	void label::own_style_updated()
+	void label::own_style_updated() const
 	{
 		element::own_style_updated();
 		cached_state_.reset();