diff --git a/index.js b/index.js
index 3c92c47..712a97f 100644
--- a/index.js
+++ b/index.js
@@ -98,7 +98,7 @@ Wallet.prototype.toV3 = function (password, opts) {
     version: 3,
     id: uuid.v4({ random: opts.uuid || crypto.randomBytes(16) }),
     address: this.getAddress().toString('hex'),
-    Crypto: {
+    crypto: {
       ciphertext: ciphertext.toString('hex'),
       cipherparams: {
         iv: iv.toString('hex')
diff --git a/test/index.js b/test/index.js
index d8222be..32e6d2c 100644
--- a/test/index.js
+++ b/test/index.js
@@ -66,14 +66,14 @@ describe('.toV3()', function () {
   it('should work with PBKDF2', function () {
     var key = new Buffer('efca4cdd31923b50f4214af5d2ae10e7ac45a5019e9431cc195482d707485378', 'hex')
     var wallet = Wallet.fromPrivateKey(key)
-    var w = '{"version":3,"id":"7e59dc02-8d42-409d-b29a-a8a0f862cc81","address":"b14ab53e38da1c172f877dbc6d65e4a1b0474c3c","Crypto":{"ciphertext":"01ee7f1a3c8d187ea244c92eea9e332ab0bb2b4c902d89bdd71f80dc384da1be","cipherparams":{"iv":"cecacd85e9cb89788b5aab2f93361233"},"cipher":"aes-128-ctr","kdf":"pbkdf2","kdfparams":{"dklen":32,"salt":"dc9e4a98886738bd8aae134a1f89aaa5a502c3fbd10e336136d4d5fe47448ad6","c":262144,"prf":"hmac-sha256"},"mac":"0c02cd0badfebd5e783e0cf41448f84086a96365fc3456716c33641a86ebc7cc"}}'
+    var w = '{"version":3,"id":"7e59dc02-8d42-409d-b29a-a8a0f862cc81","address":"b14ab53e38da1c172f877dbc6d65e4a1b0474c3c","crypto":{"ciphertext":"01ee7f1a3c8d187ea244c92eea9e332ab0bb2b4c902d89bdd71f80dc384da1be","cipherparams":{"iv":"cecacd85e9cb89788b5aab2f93361233"},"cipher":"aes-128-ctr","kdf":"pbkdf2","kdfparams":{"dklen":32,"salt":"dc9e4a98886738bd8aae134a1f89aaa5a502c3fbd10e336136d4d5fe47448ad6","c":262144,"prf":"hmac-sha256"},"mac":"0c02cd0badfebd5e783e0cf41448f84086a96365fc3456716c33641a86ebc7cc"}}'
     // FIXME: just test for ciphertext and mac?
     assert.equal(wallet.toV3String('testtest', { kdf: 'pbkdf2', uuid: uuid, salt: salt, iv: iv }), w)
   })
   it('should work with Scrypt', function () {
     var key = new Buffer('efca4cdd31923b50f4214af5d2ae10e7ac45a5019e9431cc195482d707485378', 'hex')
     var wallet = Wallet.fromPrivateKey(key)
-    var w = '{"version":3,"id":"7e59dc02-8d42-409d-b29a-a8a0f862cc81","address":"b14ab53e38da1c172f877dbc6d65e4a1b0474c3c","Crypto":{"ciphertext":"c52682025b1e5d5c06b816791921dbf439afe7a053abb9fac19f38a57499652c","cipherparams":{"iv":"cecacd85e9cb89788b5aab2f93361233"},"cipher":"aes-128-ctr","kdf":"scrypt","kdfparams":{"dklen":32,"salt":"dc9e4a98886738bd8aae134a1f89aaa5a502c3fbd10e336136d4d5fe47448ad6","n":262144,"r":8,"p":1},"mac":"27b98c8676dc6619d077453b38db645a4c7c17a3e686ee5adaf53c11ac1b890e"}}'
+    var w = '{"version":3,"id":"7e59dc02-8d42-409d-b29a-a8a0f862cc81","address":"b14ab53e38da1c172f877dbc6d65e4a1b0474c3c","crypto":{"ciphertext":"c52682025b1e5d5c06b816791921dbf439afe7a053abb9fac19f38a57499652c","cipherparams":{"iv":"cecacd85e9cb89788b5aab2f93361233"},"cipher":"aes-128-ctr","kdf":"scrypt","kdfparams":{"dklen":32,"salt":"dc9e4a98886738bd8aae134a1f89aaa5a502c3fbd10e336136d4d5fe47448ad6","n":262144,"r":8,"p":1},"mac":"27b98c8676dc6619d077453b38db645a4c7c17a3e686ee5adaf53c11ac1b890e"}}'
     this.timeout(180000) // 3minutes
     // FIXME: just test for ciphertext and mac?
     assert.equal(wallet.toV3String('testtest', { kdf: 'scrypt', uuid: uuid, salt: salt, iv: iv }), w)