diff --git a/src/transaction_builder.js b/src/transaction_builder.js
index f0863d3..5a86ffb 100644
--- a/src/transaction_builder.js
+++ b/src/transaction_builder.js
@@ -24,8 +24,6 @@ TransactionBuilder.prototype.addInput = function(prevTx, index, prevOutScript) {
     Array.prototype.reverse.call(prevOutHash)
 
   } else if (prevTx instanceof Transaction) {
-    assert(prevOutScript === undefined, 'Unnecessary Script provided')
-
     prevOutHash = prevTx.getHash()
     prevOutScript = prevTx.outs[index].script
 
diff --git a/test/transaction_builder.js b/test/transaction_builder.js
index 0d2abdf..5bc972a 100644
--- a/test/transaction_builder.js
+++ b/test/transaction_builder.js
@@ -68,12 +68,6 @@ describe('TransactionBuilder', function() {
       assert.equal(txb.addInput(prevTxHash, 1), 1)
     })
 
-    it('throws if a Tx and prevOutScript is given', function() {
-      assert.throws(function() {
-        txb.addInput(prevTx, 0, privScript)
-      }, /Unnecessary Script provided/)
-    })
-
     it('throws if prevOutScript is not supported', function() {
       assert.throws(function() {
         txb.addInput(prevTxHash, 0, Script.EMPTY)