diff --git a/acme/autocert/listener.go b/acme/autocert/listener.go
index 1e06981..cb48609 100644
--- a/acme/autocert/listener.go
+++ b/acme/autocert/listener.go
@@ -72,7 +72,6 @@
 // the Manager m's Prompt, Cache, HostPolicy, and other desired options.
 func (m *Manager) Listener() net.Listener {
 	ln := &listener{
-		m:    m,
 		conf: m.TLSConfig(),
 	}
 	ln.tcpListener, ln.tcpListenErr = net.Listen("tcp", ":443")
@@ -80,7 +79,6 @@
 }
 
 type listener struct {
-	m    *Manager
 	conf *tls.Config
 
 	tcpListener  net.Listener