--- ./asclock.c.00	1999-03-26 08:38:29.000000000 +0100
+++ ./asclock.c	2007-02-17 14:57:26.000000000 +0100
@@ -448,6 +448,7 @@
     gtk_init( &argc, &argv );
     my->window = gtk_window_new( GTK_WINDOW_TOPLEVEL );
     gtk_window_set_title (GTK_WINDOW (my->window), ASCLOCK_VERSION);
+    gtk_window_set_wmclass (GTK_WINDOW (my->window), "asclock", "DockApp");
 
     gtk_signal_connect( GTK_OBJECT (my->window), "delete_event",
                         GTK_SIGNAL_FUNC (close_application), NULL );