diff --git a/src/crypto.js b/src/crypto.js
index 3e35da0..38dd569 100644
--- a/src/crypto.js
+++ b/src/crypto.js
@@ -5,7 +5,6 @@ var crypto = require('crypto')
 var convert = require('./convert')
 
 function hash160(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
 
   var step1 = sha256(buffer)
 
@@ -16,20 +15,14 @@ function hash160(buffer) {
 }
 
 function hash256(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
-
   return sha256(sha256(buffer))
 }
 
 function sha1(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
-
   return crypto.createHash('sha1').update(buffer).digest()
 }
 
 function sha256(buffer) {
-  if (!Buffer.isBuffer(buffer)) buffer = new Buffer(buffer) // FIXME: transitionary
-
   return crypto.createHash('sha256').update(buffer).digest()
 }
 
diff --git a/src/script.js b/src/script.js
index 2e47f7c..24e8e56 100644
--- a/src/script.js
+++ b/src/script.js
@@ -184,7 +184,7 @@ function isSmallIntOp(opcode) {
 }
 
 Script.prototype.getHash = function() {
-  return crypto.hash160(this.buffer)
+  return crypto.hash160(new Buffer(this.buffer))
 }
 
 /**
diff --git a/test/integration/p2sh.js b/test/integration/p2sh.js
index 474dd9a..b3708ca 100644
--- a/test/integration/p2sh.js
+++ b/test/integration/p2sh.js
@@ -28,7 +28,7 @@ describe('p2sh', function() {
       return eck.pub
     })
     var redeemScript = Script.createMultisigScriptPubKey(2, pubKeys)
-    var hash160 = crypto.hash160(redeemScript.buffer)
+    var hash160 = crypto.hash160(new Buffer(redeemScript.buffer))
     var multisigAddress = new Address(hash160, networks.testnet.scriptHash)
 
     // Check what our target address's starting value is
diff --git a/test/script.js b/test/script.js
index 9c18e4b..1de6cbd 100644
--- a/test/script.js
+++ b/test/script.js
@@ -102,7 +102,7 @@ describe('Script', function() {
     it('should create valid redeemScript', function() {
       var redeemScript = Script.createMultisigScriptPubKey(2, pubKeys)
 
-      var hash160 = crypto.hash160(redeemScript.buffer)
+      var hash160 = crypto.hash160(new Buffer(redeemScript.buffer))
       var multisigAddress = new Address(hash160, networks.bitcoin.scriptHash)
 
       assert.equal(multisigAddress.toString(), '32vYjxBb7pHJJyXgNk8UoK3BdRDxBzny2v')