diff --git a/pkg/disk/x509.go b/pkg/disk/x509.go
index 45fae8d9..013fb810 100644
--- a/pkg/disk/x509.go
+++ b/pkg/disk/x509.go
@@ -88,7 +88,7 @@ func writeCerts(file string, certs []*x509.Certificate) error {
 // formats as PEM, and writes it to file
 func writeKey(file string, data []byte) error {
 	b := &pem.Block{
-		Type:  "EC PRIVATE KEY",
+		Type:  "PRIVATE KEY",
 		Bytes: data,
 	}