diff --git a/js/coin.js b/js/coin.js
index 8f8b98b..4ca2f7a 100644
--- a/js/coin.js
+++ b/js/coin.js
@@ -452,7 +452,7 @@
 
 		// derive key from index
 		r.derive = function(i){
-			i = (i)?:0;
+			i = (i)?i:0;
 			var blob = (Crypto.util.hexToBytes(this.keys.pubkey)).concat(coinjs.numToBytes(i,4).reverse());
 
 			var j = new jsSHA(Crypto.util.bytesToHex(blob), 'HEX');
diff --git a/sha1sum b/sha1sum
index 01cfe05..f5b64bc 100644
--- a/sha1sum
+++ b/sha1sum
@@ -10,7 +10,7 @@ f7c09f2f5a721371e7d478050119f7e2d58e3ef9  ./js/crypto-sha256-hmac.js
 ad038e1f39646b68ae666324ed4c2882a8c42474  ./js/qrcode.js
 64eb4ea5c882f8bce3e1885bf00728455f1c2f4c  ./js/ripemd160.js
 114089ef2a3feb6d4db4f9cabcb186d7750d5884  ./js/sha512.js
-6db735d6bc9fbacd7a874ad3c4dee92b6f8d95ce  ./js/coin.js
+782ecafc45b2e791451b9d43659c815c76d4816d  ./js/coin.js
 8e921b2156d232871540e168e1677368b5611dc9  ./js/coinbin.js
 ae49e56999d82802727455f0ba83b63acd90a22b  ./js/jquery-1.9.1.min.js
 5f570018ed044eafd464f7e0ab1783b966224055  ./LICENCE