diff --git a/src/block.js b/src/block.js
index f1d8b67..66aafbc 100644
--- a/src/block.js
+++ b/src/block.js
@@ -135,12 +135,7 @@ Block.calculateTarget = function (bits) {
 
   var target = new Buffer(32)
   target.fill(0)
-
-  target[i] = mantissa & 0xff
-  target[i - 1] = mantissa >> 8
-  target[i - 2] = mantissa >> 16
-  target[i - 3] = mantissa >> 24
-
+  target.writeUInt32BE(mantissa, i - 3)
   return target
 }
 
diff --git a/test/integration/stealth.js b/test/integration/stealth.js
index f06f7de..0eabac1 100644
--- a/test/integration/stealth.js
+++ b/test/integration/stealth.js
@@ -51,7 +51,8 @@ function stealthDualSend (e, R, Q) {
 function stealthDualScan (d, R, eG) {
   var eQ = eG.multiply(d) // shared secret
   var c = bigi.fromBuffer(bitcoin.crypto.sha256(eQ.getEncoded()))
-  var vG = new bitcoin.ECPair(null, R.add(G.multiply(c)))
+  var cG = G.multiply(c)
+  var vG = new bitcoin.ECPair(null, R.add(cG))
 
   return vG
 }