diff --git a/lib/ec.js b/lib/ec.js
index e4434dc..d464eb9 100644
--- a/lib/ec.js
+++ b/lib/ec.js
@@ -1,12 +1,13 @@
 'use strict';
 
+var x509 = module.exports;
+
 var ASN1 = require('./asn1-packer.js');
 var Enc = require('./encoding.js');
-var x509 = module.exports;
 
 // 1.2.840.10045.3.1.7
 // prime256v1 (ANSI X9.62 named elliptic curve)
-var OBJ_ID_EC  = '06 08 2A8648CE3D030107'.replace(/\s+/g, '').toLowerCase();
+var OBJ_ID_EC_256  = '06 08 2A8648CE3D030107'.replace(/\s+/g, '').toLowerCase();
 // 1.3.132.0.34
 // secp384r1 (SECG (Certicom) named elliptic curve)
 var OBJ_ID_EC_384 = '06 05 2B81040022'.replace(/\s+/g, '').toLowerCase();
@@ -18,7 +19,7 @@ x509.packSec1 = function (jwk) {
   var d = Enc.base64ToHex(jwk.d);
   var x = Enc.base64ToHex(jwk.x);
   var y = Enc.base64ToHex(jwk.y);
-  var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC : OBJ_ID_EC_384;
+  var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC_256 : OBJ_ID_EC_384;
   return Enc.hexToUint8(
     ASN1('30'
     , ASN1.UInt('01')
@@ -31,7 +32,7 @@ x509.packPkcs8 = function (jwk) {
   var d = Enc.base64ToHex(jwk.d);
   var x = Enc.base64ToHex(jwk.x);
   var y = Enc.base64ToHex(jwk.y);
-  var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC : OBJ_ID_EC_384;
+  var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC_256 : OBJ_ID_EC_384;
   return Enc.hexToUint8(
     ASN1('30'
     , ASN1.UInt('00')
@@ -49,7 +50,7 @@ x509.packPkcs8 = function (jwk) {
 x509.packSpki = function (jwk) {
   var x = Enc.base64ToHex(jwk.x);
   var y = Enc.base64ToHex(jwk.y);
-  var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC : OBJ_ID_EC_384;
+  var objId = ('P-256' === jwk.crv) ? OBJ_ID_EC_256 : OBJ_ID_EC_384;
   return Enc.hexToUint8(
     ASN1('30'
     , ASN1('30'