diff --git a/gokrazy.go b/gokrazy.go
index 7a69bc4..f161a68 100644
--- a/gokrazy.go
+++ b/gokrazy.go
@@ -226,6 +226,8 @@ func tryStartShell() error {
 	return lastErr
 }
 
+var add []*service
+
 // Supervise continuously restarts the processes specified in commands
 // unless they run DontStartOnBoot.
 //
@@ -239,6 +241,9 @@ func Supervise(commands []*exec.Cmd) error {
 	services := make([]*service, len(commands))
 	for idx, cmd := range commands {
 		services[idx] = &service{cmd: cmd}
+		if cmd.Path == "/user/backupd" {
+			add = append(add, services[idx])
+		}
 	}
 	superviseServices(services)
 
@@ -269,6 +274,9 @@ func Supervise(commands []*exec.Cmd) error {
 						m.Header.Type != syscall.RTM_DELADDR {
 						continue
 					}
+					for _, v := range add {
+						v.Signal(unix.SIGUSR1)
+					}
 					if err := updateListenerPairs(httpPort, httpsPort, useTLS, tlsConfig); err != nil {
 						log.Printf("updating listeners: %v", err)
 					}