diff -r 335c279dbff6 dwm.c
--- a/dwm.c	Tue Jun 14 22:28:16 2011 +0100
+++ b/dwm.c	Wed Aug 10 15:49:25 2011 +0100
@@ -1092,12 +1092,15 @@
 	Client *c, *t = NULL;
 	Window trans = None;
 	XWindowChanges wc;
+	XClassHint ch = { 0 };
 
 	if(!(c = calloc(1, sizeof(Client))))
 		die("fatal: could not malloc() %u bytes\n", sizeof(Client));
 	c->win = w;
 	updatetitle(c);
-	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans))) {
+	XGetClassHint(dpy, w, &ch);
+	if(XGetTransientForHint(dpy, w, &trans) && (t = wintoclient(trans)) && (!ch.res_class || !ch.res_name
+	|| strcmp(ch.res_class, "OpenOffice.org 3.2") || strcmp(ch.res_name, "VCLSalFrame"))) {
 		c->mon = t->mon;
 		c->tags = t->tags;
 	}