diff --git a/bin/dimmer b/bin/dimmer
index 7352ca2..229ab34 100755
--- a/bin/dimmer
+++ b/bin/dimmer
@@ -8,17 +8,11 @@
 import gi
 
 gi.require_version("Gtk", "3.0")
-gi.require_version("Wnck", "3.0")
-from gi.repository import Gtk, Gdk, GLib, Wnck
+from gi.repository import Gtk, Gdk, GLib
 import cairo
 import argparse
 
 
-def on_window_opened(screen, window, options):
-    if window.get_class_group_name() == options.quit_when:
-        Gtk.main_quit()
-
-
 def on_realize(widget):
     window = widget.get_window()
     window.set_override_redirect(True)
@@ -75,7 +69,6 @@ if __name__ == "__main__":
     options = parser.parse_args()
 
     display = Gdk.Display.get_default()
-    screen = Wnck.Screen.get_default();
     for i in range(display.get_n_monitors()):
         geom = display.get_monitor(i).get_geometry()
         once = []
@@ -92,7 +85,6 @@ if __name__ == "__main__":
         window.connect("draw", on_draw, options, [])
         window.connect("delete-event", Gtk.main_quit)
         window.connect("realize", on_realize)
-        screen.connect("window-opened", on_window_opened, options)
 
         window.show_all()