diff --git a/lib/hdkey.js b/lib/hdkey.js
index 581a789..f48492c 100644
--- a/lib/hdkey.js
+++ b/lib/hdkey.js
@@ -6,8 +6,6 @@ var ecurve = require('ecurve')
 var curve = ecurve.getCurveByName('secp256k1')
 var Point = ecurve.Point
 
-module.exports = HDKey
-
 var MASTER_SECRET = new Buffer('Bitcoin seed')
 var HARDENED_OFFSET = 0x80000000
 var LEN = 78
@@ -229,3 +227,6 @@ function hash160 (buf) {
   var sha = crypto.createHash('sha256').update(buf).digest()
   return crypto.createHash('rmd160').update(sha).digest()
 }
+
+HDKey.HARDENED_OFFSET = HARDENED_OFFSET
+module.exports = HDKey
diff --git a/test/hdkey.test.js b/test/hdkey.test.js
index f3fbc5b..96ce627 100644
--- a/test/hdkey.test.js
+++ b/test/hdkey.test.js
@@ -133,4 +133,10 @@ describe('hdkey', function () {
       assert.equal(newKey.privateExtendedKey, expected)
     })
   })
+
+  describe('HARDENED_OFFSET', function () {
+    it('should be set', function () {
+      assert(HDKey.HARDENED_OFFSET)
+    })
+  })
 })