diff --git a/sys/net/altq/altq_hfsc.c b/sys/net/altq/altq_hfsc.c
--- a/sys/net/altq/altq_hfsc.c
+++ b/sys/net/altq/altq_hfsc.c
@@ -514,9 +514,9 @@
 		if ((p = parent->cl_children) == NULL)
 			parent->cl_children = cl;
 		else {
-			while (p->cl_siblings != NULL)
-				p = p->cl_siblings;
-			p->cl_siblings = cl;
+			/* Put new class at beginning of list */
+			cl->cl_siblings = parent->cl_children;
+			parent->cl_children = cl;
 		}
 	}
 	IFQ_UNLOCK(hif->hif_ifq);