diff --git a/acme/acme.go b/acme/acme.go
index dd536574..ccf30368 100644
--- a/acme/acme.go
+++ b/acme/acme.go
@@ -25,4 +25,6 @@ type Provider interface {
 	Listen(...string) (net.Listener, error)
 	// TLSConfig returns a tls config
 	TLSConfig(...string) (*tls.Config, error)
+	// Implementation of the acme provider
+	String() string
 }
diff --git a/acme/autocert/autocert.go b/acme/autocert/autocert.go
index cb61032e..e2ed08c9 100644
--- a/acme/autocert/autocert.go
+++ b/acme/autocert/autocert.go
@@ -40,6 +40,10 @@ func (a *autocertProvider) TLSConfig(hosts ...string) (*tls.Config, error) {
 	return m.TLSConfig(), nil
 }
 
+func (a *autocertProvider) String() string {
+	return "autocert"
+}
+
 // New returns an autocert acme.Provider
 func NewProvider() acme.Provider {
 	return &autocertProvider{}