diff --git a/src/cryptography/hazmat/bindings/openssl/x509.py b/src/cryptography/hazmat/bindings/openssl/x509.py
index caa3396983af..6f12b72537b1 100644
--- a/src/cryptography/hazmat/bindings/openssl/x509.py
+++ b/src/cryptography/hazmat/bindings/openssl/x509.py
@@ -310,9 +310,14 @@
 EC_KEY *d2i_EC_PUBKEY(EC_KEY **, const unsigned char **, long);
 EC_KEY *d2i_EC_PUBKEY_bio(BIO *, EC_KEY **);
 int i2d_EC_PUBKEY_bio(BIO *, EC_KEY *);
+EC_KEY *d2i_ECPrivateKey(EC_KEY **, const unsigned char **, long);
 EC_KEY *d2i_ECPrivateKey_bio(BIO *, EC_KEY **);
+int i2d_ECPrivateKey(EC_KEY *, unsigned char **);
 int i2d_ECPrivateKey_bio(BIO *, EC_KEY *);
 
+EC_KEY *o2i_ECPublicKey(EC_KEY **, const unsigned char **, long);
+int i2o_ECPublicKey(EC_KEY *, unsigned char **);
+
 // declared in safestack
 int sk_ASN1_OBJECT_num(Cryptography_STACK_OF_ASN1_OBJECT *);
 ASN1_OBJECT *sk_ASN1_OBJECT_value(Cryptography_STACK_OF_ASN1_OBJECT *, int);
@@ -329,8 +334,13 @@
 EC_KEY *(*d2i_EC_PUBKEY)(EC_KEY **, const unsigned char **, long) = NULL;
 EC_KEY *(*d2i_EC_PUBKEY_bio)(BIO *, EC_KEY **) = NULL;
 int (*i2d_EC_PUBKEY_bio)(BIO *, EC_KEY *) = NULL;
+EC_KEY *(*d2i_ECPrivateKey)(EC_KEY **, const unsigned char **, long) = NULL;
 EC_KEY *(*d2i_ECPrivateKey_bio)(BIO *, EC_KEY **) = NULL;
+int (*i2d_ECPrivateKey)(EC_KEY *, unsigned char **) = NULL;
 int (*i2d_ECPrivateKey_bio)(BIO *, EC_KEY *) = NULL;
+
+EC_KEY *(*o2i_ECPublicKey)(EC_KEY **, const unsigned char **, long) = NULL;
+int (*i2o_ECPublicKey)(EC_KEY *, unsigned char **) = NULL;
 #endif
 """
 
@@ -340,7 +350,11 @@
         "d2i_EC_PUBKEY",
         "d2i_EC_PUBKEY_bio",
         "i2d_EC_PUBKEY_bio",
+        "d2i_ECPrivateKey",
         "d2i_ECPrivateKey_bio",
+        "i2d_ECPrivateKey",
         "i2d_ECPrivateKey_bio",
+        "i2o_ECPublicKey",
+        "o2i_ECPublicKey",
     ]
 }