diff --git a/crypto/x509/x_all.c b/crypto/x509/x_all.c
index c430a7d3..2a93b873 100644
--- a/crypto/x509/x_all.c
+++ b/crypto/x509/x_all.c
@@ -499,3 +499,13 @@ EVP_PKEY *d2i_PUBKEY_bio(BIO *bp, EVP_PKEY **a)
 {
     return ASN1_d2i_bio_of(EVP_PKEY, EVP_PKEY_new, d2i_PUBKEY, bp, a);
 }
+
+DH *d2i_DHparams_bio(BIO *bp, DH **dh)
+{
+    return ASN1_d2i_bio_of(DH, DH_new, d2i_DHparams, bp, dh);
+}
+
+int i2d_DHparams_bio(BIO *bp, const DH *dh)
+{
+    return ASN1_i2d_bio_of_const(DH, i2d_DHparams, bp, dh);
+}
diff --git a/include/openssl/x509.h b/include/openssl/x509.h
index 65d68c4b..a0f7645b 100644
--- a/include/openssl/x509.h
+++ b/include/openssl/x509.h
@@ -671,6 +671,8 @@ OPENSSL_EXPORT int i2d_PrivateKey_bio(BIO *bp, EVP_PKEY *pkey);
 OPENSSL_EXPORT EVP_PKEY *d2i_PrivateKey_bio(BIO *bp, EVP_PKEY **a);
 OPENSSL_EXPORT int i2d_PUBKEY_bio(BIO *bp, EVP_PKEY *pkey);
 OPENSSL_EXPORT EVP_PKEY *d2i_PUBKEY_bio(BIO *bp, EVP_PKEY **a);
+OPENSSL_EXPORT DH *d2i_DHparams_bio(BIO *bp, DH **dh);
+OPENSSL_EXPORT int i2d_DHparams_bio(BIO *bp, const DH *dh);
 
 OPENSSL_EXPORT X509 *X509_dup(X509 *x509);
 OPENSSL_EXPORT X509_ATTRIBUTE *X509_ATTRIBUTE_dup(X509_ATTRIBUTE *xa);