diff --git a/index.js b/index.js
index a31b5886f..7c4f0cc21 100644
--- a/index.js
+++ b/index.js
@@ -51,6 +51,7 @@ bitcore.deps.elliptic = require('elliptic');
 
 // Internal usage, exposed for testing/advanced tweaking
 bitcore._HDKeyCache = require('./lib/hdkeycache');
+bitcore.Transaction.sighash = require('./lib/transaction/sighash');
 
 // module information
 bitcore.version = 'v'+require('./package.json').version;
diff --git a/test/transaction/sighash.js b/test/transaction/sighash.js
index 9ee89c801..a1e434ec7 100644
--- a/test/transaction/sighash.js
+++ b/test/transaction/sighash.js
@@ -4,9 +4,10 @@ var buffer = require('buffer');
 
 var chai = require('chai');
 var should = chai.should();
-var Script = require('../../lib/script');
-var Transaction = require('../../lib/transaction');
-var sighash = require('../../lib/transaction/sighash');
+var bitcore = require('../../');
+var Script = bitcore.Script;
+var Transaction = bitcore.Transaction;
+var sighash = Transaction.sighash;
 
 var vectors_sighash = require('../data/sighash.json');