Index: src/netlist.c
===================================================================
--- src/netlist.c	(revision 29032)
+++ src/netlist.c	(revision 29033)
@@ -209,6 +209,7 @@
 	undo_net_alloc_t *a = udata;
 	if (pcb_net_alloc_(a->pcb, &a->pcb->netlist[a->nl_idx], a->netname) == NULL)
 		return -1;
+	pcb_netlist_changed(0);
 	return 0;
 }
 
@@ -215,7 +216,10 @@
 static int undo_net_alloc_undo(void *udata)
 {
 	undo_net_alloc_t *a = udata;
-	return pcb_net_del(&a->pcb->netlist[a->nl_idx], a->netname);
+	int res = pcb_net_del(&a->pcb->netlist[a->nl_idx], a->netname);
+	if (res == 0)
+		pcb_netlist_changed(0);
+	return res;
 }
 
 static void undo_net_alloc_print(void *udata, char *dst, size_t dst_len)