diff --git a/src/dialog.cc b/src/dialog.cc
index 4f4faf1..079ddb4 100644
--- a/src/dialog.cc
+++ b/src/dialog.cc
@@ -368,7 +368,7 @@ int a_Dialog_choice(const char *title, const char *msg, ...)
    int ww = 140 + n * 60, wh = 120;
    int bw = (ww - gap) / n - gap, bh = 45;
 
-   Fl_Window *window = new Fl_Window(ww, wh, title);
+   auto window = std::make_unique< Fl_Window >(ww, wh, title);
    window->set_modal();
    window->begin();
 
@@ -402,7 +402,7 @@ int a_Dialog_choice(const char *title, const char *msg, ...)
    _MSG("Dialog_choice answer = %d\n", answer);
    td->buffer(NULL);
    delete buf;
-   delete window;
+   window.reset();
 
    return choice_answer;
 }