diff --git a/wgengine/magicsock/magicsock.go b/wgengine/magicsock/magicsock.go
index 6bf31b6bb..6f3bbec6a 100644
--- a/wgengine/magicsock/magicsock.go
+++ b/wgengine/magicsock/magicsock.go
@@ -140,6 +140,7 @@ func Listen(opts Options) (*Conn, error) {
 	epUpdateCtx, epUpdateCancel := context.WithCancel(context.Background())
 	c := &Conn{
 		pconn:          new(RebindingUDPConn),
+		pconnPort:      opts.Port,
 		donec:          make(chan struct{}),
 		stunServers:    append([]string{}, opts.STUN...),
 		startEpUpdate:  make(chan struct{}, 1),