diff --git a/source/ubl-settings-system.h b/source/ubl-settings-system.h
index f885afe..5f04d17 100644
--- a/source/ubl-settings-system.h
+++ b/source/ubl-settings-system.h
@@ -201,4 +201,7 @@ void on_id_changed(GtkEntry *self, main_window *widgets);
 void on_check_domain_connected(GtkWidget *self, main_window *widgets);
 void yon_interface_update(main_window *widgets);
 
+void on_hostname_changed(GtkEntry *self, main_window *widgets);
+void on_language_changed(GtkComboBox *self, main_window *widgets);
+void on_console_font_changed(GtkComboBox *self, main_window *widgets);
 void on_hostname_changed(GtkEntry *self, main_window *widgets);
\ No newline at end of file