diff --git a/key.go b/key.go
index c7b4665e..f51c0c3d 100644
--- a/key.go
+++ b/key.go
@@ -89,6 +89,10 @@ type PrivateKey interface {
 	// MarshalPKCS1PrivateKeyPEM converts the private key to PEM-encoded PKCS1
 	// format
 	MarshalPKCS1PrivateKeyPEM() (pem_block []byte, err error)
+	
+	// MarshalPKCS1PrivateKeyPEM converts the private key to PEM-encoded PKCS8
+	// format
+	MarshalPKCS8PrivateKeyPEM() (pem_block []byte, err error)
 
 	// MarshalPKCS1PrivateKeyDER converts the private key to DER-encoded PKCS1
 	// format
@@ -170,6 +174,25 @@ func (key *pKey) MarshalPKCS1PrivateKeyPEM() (pem_block []byte,
 	return ioutil.ReadAll(asAnyBio(bio))
 }
 
+func (key *pKey) MarshalPKCS8PrivateKeyPEM() (pem_block []byte,
+err error) {
+	bio := C.BIO_new(C.BIO_s_mem())
+	if bio == nil {
+		return nil, errors.New("failed to allocate memory BIO")
+	}
+	defer C.BIO_free(bio)
+
+	// PEM_write_bio_PrivateKey_traditional will use the key-specific PKCS1
+	// format if one is available for that key type, otherwise it will encode
+	// to a PKCS8 key.
+	if int(C.X_PEM_write_bio_PrivateKey_pkcs8(bio, key.key, nil, nil,
+		C.int(0), nil, nil)) != 1 {
+		return nil, errors.New("failed dumping private key")
+	}
+
+	return ioutil.ReadAll(asAnyBio(bio))
+}
+
 func (key *pKey) MarshalPKCS1PrivateKeyDER() (der_block []byte,
 	err error) {
 	bio := C.BIO_new(C.BIO_s_mem())
diff --git a/shim.c b/shim.c
index f99fd495..f8224c58 100644
--- a/shim.c
+++ b/shim.c
@@ -316,6 +316,11 @@ int X_PEM_write_bio_PrivateKey_traditional(BIO *bio, EVP_PKEY *key, const EVP_CI
  ************************************************
  */
 
+
+int X_PEM_write_bio_PrivateKey_pkcs8(BIO *bio, EVP_PKEY *key, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u) {
+	return PEM_write_bio_PKCS8PrivateKey(bio, key, enc, kstr, klen, cb, u);
+}
+
 int X_shim_init() {
 	int rc = 0;
 
diff --git a/shim.h b/shim.h
index 0dfdcecf..d75cb486 100644
--- a/shim.h
+++ b/shim.h
@@ -159,4 +159,6 @@ extern int X_sk_X509_num(STACK_OF(X509) *sk);
 extern X509 *X_sk_X509_value(STACK_OF(X509)* sk, int i);
 
 /* PEM methods */
-extern int X_PEM_write_bio_PrivateKey_traditional(BIO *bio, EVP_PKEY *key, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u);
\ No newline at end of file
+extern int X_PEM_write_bio_PrivateKey_traditional(BIO *bio, EVP_PKEY *key, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u);
+/* PEM methods */
+extern int X_PEM_write_bio_PrivateKey_pkcs8(BIO *bio, EVP_PKEY *key, const EVP_CIPHER *enc, unsigned char *kstr, int klen, pem_password_cb *cb, void *u);