diff --git a/cmd/meshnamed/main.go b/cmd/meshnamed/main.go
index 23bd101..872c470 100644
--- a/cmd/meshnamed/main.go
+++ b/cmd/meshnamed/main.go
@@ -32,6 +32,7 @@ var (
 	listenAddr, networksconf string
 	meshipNetworksconf	 string
 	getName, getIP           string
+	acmePort		 string
 	debug, noMeshIP          bool
 )
 
@@ -42,6 +43,7 @@ func init() {
 	flag.BoolVar(&noMeshIP, "nomeship", false, "disable .meship resolver")
 	flag.StringVar(&getName, "getname", "", "convert IPv6 address to a name")
 	flag.StringVar(&getIP, "getip", "", "convert a name to IPv6 address")
+	flag.StringVar(&acmePort, "acmeport", "53536", "try alternative port for acme challenges")
 	flag.BoolVar(&debug, "debug", false, "enable debug logging")
 }
 
@@ -80,7 +82,7 @@ func main() {
 		logger.Fatalln(err)
 	}
 
-	s := meshname.New(logger, listenAddr, networks, meshipNetworks, !noMeshIP)
+	s := meshname.New(logger, listenAddr, networks, meshipNetworks, !noMeshIP, acmePort)
 
 	if err := s.Start(); err != nil {
 		logger.Fatal(err)