diff --git a/app_win_2_back.cpp b/app_win_2_back.cpp
index 7addbd1..334ba9e 100644
--- a/app_win_2_back.cpp
+++ b/app_win_2_back.cpp
@@ -36,7 +36,7 @@ namespace gui_to_app {
     void AppWin2Back::on_activate() {
         Application::on_activate();
 
-        const auto app_builder = [this]() -> Glib::RefPtr<Gtk::Builder> {
+        app_builder = [this]() -> Glib::RefPtr<Gtk::Builder> {
             try {
                 return Gtk::Builder::create_from_file("window_ui.ui");
             } catch (const std::exception &e) {