diff --git a/client.go b/client.go
index 7614968..f357e56 100644
--- a/client.go
+++ b/client.go
@@ -125,6 +125,7 @@ func (c *Client) do(req *Request, via []*Request) (*Response, error) {
 				return resp, err
 			}
 			c.Certificates.Add(hostname+path, cert)
+			req.Certificate = &cert
 			return c.do(req, via)
 		}
 		return resp, ErrCertificateRequired