diff --git a/main.go b/main.go
index caf9937..c07389d 100644
--- a/main.go
+++ b/main.go
@@ -125,7 +125,7 @@ func parseTLS(srv *Server, d *Directive) error {
 			if err := child.ParseParams(&caURL); err != nil {
 				return err
 			}
-			srv.acmeManager.CA = caURL
+			srv.ACMEManager.CA = caURL
 		default:
 			return fmt.Errorf("unknown %q directive", child.Name)
 		}
diff --git a/server.go b/server.go
index 276ca88..f9e5aab 100644
--- a/server.go
+++ b/server.go
@@ -16,8 +16,8 @@ type Server struct {
 	Listeners    map[string]*Listener // indexed by listening address
 	Frontends    []*Frontend
 	ManagedNames []string
+	ACMEManager *certmagic.ACMEManager
 
-	acmeManager *certmagic.ACMEManager
 	certmagic   *certmagic.Config
 }
 
@@ -33,7 +33,7 @@ func NewServer() *Server {
 
 	return &Server{
 		Listeners:   make(map[string]*Listener),
-		acmeManager: mgr,
+		ACMEManager: mgr,
 		certmagic:   cfg,
 	}
 }