diff --git a/source/libublsettingsui-gtk3.c b/source/libublsettingsui-gtk3.c
index d7231ec..df058f0 100644
--- a/source/libublsettingsui-gtk3.c
+++ b/source/libublsettingsui-gtk3.c
@@ -48,10 +48,6 @@ SAVE_MODE_TYPE yon_ubl_save_mode_get_type(char *type){
 
 //signal emmit handlers - no header initialization
 
-void on_subwindow_close(GtkWidget *self){
-    gtk_widget_destroy(gtk_widget_get_toplevel(self));
-}
-
 void yon_open_browser(GtkWidget *self, char *link){
     GtkWidget *window = yon_ubl_browser_window_open(link,template_app_information.app_title);
     if (window)
diff --git a/source/libublsettingsui-gtk3.h b/source/libublsettingsui-gtk3.h
index ab023bf..2fbb1d0 100644
--- a/source/libublsettingsui-gtk3.h
+++ b/source/libublsettingsui-gtk3.h
@@ -304,13 +304,5 @@ void on_about(GtkWidget *self, char *version_application);
 */
 void on_open_documentation_confirmation(GtkWidget *self, char *link);
 
-/**on_subwindow_close(GtkWidget *self)
- * [EN]
- * Closes window in which [self] is contained.
- * [RU]
- * Закрывает окно, в котором расположен виджет [self].
-*/
-void on_subwindow_close(GtkWidget *self);
-
 int yon_ubl_setup_arguments(int argc, char *argv[],config_str *unfound_arguments, int *arguments_size, char *additional_options_output);
 #endif
\ No newline at end of file