diff --git a/dwm.c b/dwm.c
index c9c2a3b..fdbee57 100644
--- a/dwm.c
+++ b/dwm.c
@@ -1017,7 +1017,7 @@ focusstack(const Arg *arg)
 {
 	Client *c = NULL, *i;
 
-	if (!selmon->sel)
+	if (!selmon->sel || selmon->sel->isfullscreen)
 		return;
 	if (arg->i > 0) {
 		for (c = selmon->sel->next; c && !ISVISIBLE(c); c = c->next);