diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 2d72513f..b376612b 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -5369,6 +5369,7 @@ sub vmconfig_update_net {
 	if ($have_sdn) {
 	    PVE::Network::SDN::Vnets::add_next_free_cidr($newnet->{bridge}, $conf->{name}, $newnet->{macaddr}, $vmid, undef, 1);
 	}
+	PVE::Network::SDN::Vnets::add_dhcp_mapping($newnet->{bridge}, $newnet->{macaddr});
 	vm_deviceplug($storecfg, $conf, $vmid, $opt, $newnet, $arch, $machine_type);
     } else {
 	die "skip\n";