--- ./wmrack.c.00	2007-11-26 00:24:15.000000000 +0100
+++ ./wmrack.c	2008-04-20 08:02:14.000000000 +0200
@@ -372,7 +372,7 @@
     XSetWMNormalHints (Disp, Win, &SizeHints);
 
     classHint.res_name = "wmrack";
-    classHint.res_class = "WMRack";
+    classHint.res_class = "DockApp";
     XSetClassHint (Disp, Win, &classHint);
 
     XSelectInput (Disp, Win,