diff --git a/src/dialog.cc b/src/dialog.cc
index bf2922a..72a0979 100644
--- a/src/dialog.cc
+++ b/src/dialog.cc
@@ -469,11 +469,11 @@ int a_Dialog_user_password(const char *title, const char *msg,
    window->add(ok_button);
 
    /* "Cancel" button */
-   Fl_Button *cancel_button =
-      new EnterButton(50, y, 100, button_h, "Cancel");
+   auto cancel_button =
+      std::make_unique< EnterButton >(50, y, 100, button_h, "Cancel");
    cancel_button->labelsize(14);
    cancel_button->callback(Dialog_user_password_cb);
-   window->add(cancel_button);
+   window->add(cancel_button.release());
 
    y += button_h + 20;
    window_h = y;