static void psppire_window_base_class_init (PsppireWindowBaseClass *class);
static void psppire_window_base_init (PsppireWindowBase *window);
-G_DEFINE_ABSTRACT_TYPE (PsppireWindowBase, psppire_window_base, GTK_TYPE_WINDOW);
+G_DEFINE_ABSTRACT_TYPE (PsppireWindowBase, psppire_window_base, GTK_TYPE_APPLICATION_WINDOW);
/* Obtain a string identifying this window.