diff --git a/acme/client.go b/acme/client.go
index bc641144..5bda6bc2 100644
--- a/acme/client.go
+++ b/acme/client.go
@@ -504,6 +504,7 @@ func (c *Client) requestCertificate(authz []authorizationResource, bundle bool,
 			if len(cert) > 0 {
 
 				cerRes.CertStableURL = resp.Header.Get("Content-Location")
+				cerRes.AccountRef = c.user.GetRegistration().URI
 
 				issuedCert := pemEncode(derCertificateBytes(cert))
 				// If bundle is true, we want to return a certificate bundle.
diff --git a/acme/messages.go b/acme/messages.go
index d238df81..fe3f5748 100644
--- a/acme/messages.go
+++ b/acme/messages.go
@@ -109,6 +109,7 @@ type CertificateResource struct {
 	Domain        string `json:"domain"`
 	CertURL       string `json:"certUrl"`
 	CertStableURL string `json:"certStableUrl"`
+	AccountRef    string `json:"accountRef,omitempty"`
 	PrivateKey    []byte `json:"-"`
 	Certificate   []byte `json:"-"`
 }