Index: libtovid/metagui/gui.py
===================================================================
--- libtovid/metagui/gui.py (revision 2439)
+++ libtovid/metagui/gui.py (working copy)
@@ -458,6 +458,8 @@
         app.exit_button = tk.Button(app, text="Exit",
                             command=lambda:self.confirm_exit(app))
         app.exit_button.pack(anchor='e', side='right', fill='x')
+        # handle user closing window with window manager
+        self.protocol("WM_DELETE_WINDOW", lambda:self.confirm_exit(app))

     def show_config(self):
         """Open the GUI configuration dialog."""