diff --git a/userenckey/pkcs8.go b/userenckey/pkcs8.go
index f7f61215b15bc33aa338aba28a37c699a85546b8..1e483e6e18d4b35dcffa82894a9a2ba5e3200d97 100644
--- a/userenckey/pkcs8.go
+++ b/userenckey/pkcs8.go
@@ -4,6 +4,7 @@ package userenckey
 
 import (
 	"crypto/ecdsa"
+	"crypto/x509"
 	"encoding/pem"
 )