diff --git a/src/UI/UI_button.hpp b/src/UI/UI_button.hpp
index d682666..2696aa9 100644
--- a/src/UI/UI_button.hpp
+++ b/src/UI/UI_button.hpp
@@ -13,7 +13,7 @@ class UI_button : public UI_item
         void from_json(const json& j) override;
         json to_json() const override;
 
-        void click() const;
+        void click() const override;
     private:
         std::function<void(std::string)> p_on_click = nullptr;
 };
\ No newline at end of file
diff --git a/src/UI/UI_combobox.hpp b/src/UI/UI_combobox.hpp
index 330e105..0e9a76b 100644
--- a/src/UI/UI_combobox.hpp
+++ b/src/UI/UI_combobox.hpp
@@ -14,7 +14,7 @@ class UI_combobox : public UI_x_boxes
         UI_combobox(const json& j);
 
         void set_selected(size_t selected);
-        void set_selected(std::string selected);
+        void set_selected(std::string selected) override;
         size_t selected() const;
         std::string selected_text() const;
     
diff --git a/src/UI/UI_item.hpp b/src/UI/UI_item.hpp
index 4efa6ad..ae53215 100644
--- a/src/UI/UI_item.hpp
+++ b/src/UI/UI_item.hpp
@@ -34,6 +34,10 @@ class UI_item {
 
     virtual json to_json() const;
 
+    virtual void click() const {};
+    virtual void set_selected(std::string selected) {UNUSED(selected);};
+    virtual void set_value(double value) {UNUSED(value);};
+
   protected:
     std::string p_id;
     std::string p_type;
diff --git a/src/UI/UI_slider.hpp b/src/UI/UI_slider.hpp
index b4dddba..c36976b 100644
--- a/src/UI/UI_slider.hpp
+++ b/src/UI/UI_slider.hpp
@@ -9,7 +9,7 @@ class UI_slider : public UI_item
         UI_slider(std::string id, std::string text, Color fg_color, Color bg_color, double min, double max, double value, std::function<void(std::string, double)> on_change = nullptr);
         UI_slider(const json& j);
 
-        void set_value(double value);
+        void set_value(double value) override;
         double value() const;
 
         void from_json(const json& j) override;