diff --git a/src/emu/ui/ui.c b/src/emu/ui/ui.c
index 465d13bef9b..dbc5ba9a91c 100644
--- a/src/emu/ui/ui.c
+++ b/src/emu/ui/ui.c
@@ -880,7 +880,7 @@ void ui_manager::set_show_fps(bool show)
 //  counter visibility state
 //-------------------------------------------------
 
-bool ui_manager::show_fps()
+bool ui_manager::show_fps() const
 {
 	return m_showfps || (m_showfps_end != 0);
 }
@@ -915,7 +915,7 @@ void ui_manager::set_show_profiler(bool show)
 //  profiler visibility state
 //-------------------------------------------------
 
-bool ui_manager::show_profiler()
+bool ui_manager::show_profiler() const
 {
 	return m_show_profiler;
 }
@@ -2312,7 +2312,7 @@ static INT32 slider_crossoffset(running_machine &machine, void *arg, astring *st
 //  whether the natural keyboard is active
 //-------------------------------------------------
 
-bool ui_manager::use_natural_keyboard()
+bool ui_manager::use_natural_keyboard() const
 {
 	return m_use_natural_keyboard;
 }
diff --git a/src/emu/ui/ui.h b/src/emu/ui/ui.h
index 7d45cf6e07d..c9fb7471e17 100644
--- a/src/emu/ui/ui.h
+++ b/src/emu/ui/ui.h
@@ -142,15 +142,15 @@ public:
 	void CLIB_DECL popup_time(int seconds, const char *text, ...);
 	void show_fps_temp(double seconds);
 	void set_show_fps(bool show);
-	bool show_fps(void);
+	bool show_fps() const;
 	bool show_fps_counter();
 	void set_show_profiler(bool show);
-	bool show_profiler();
+	bool show_profiler() const;
 	void show_menu();
 	void show_mouse(bool status);
 	bool is_menu_active();
 	void paste();
-	bool use_natural_keyboard();
+	bool use_natural_keyboard() const;
 	void set_use_natural_keyboard(bool use_natural_keyboard);
 	void image_handler_ingame();