diff --git a/lib/web3/iban.js b/lib/web3/iban.js
index 5533ca2..3235025 100644
--- a/lib/web3/iban.js
+++ b/lib/web3/iban.js
@@ -146,7 +146,7 @@ Iban.isValid = function (iban) {
  * @returns {Boolean} true if it is, otherwise false
  */
 Iban.prototype.isValid = function () {
-    return /^XE[0-9]{2}(ETH[0-9A-Z]{13}|[0-9A-Z]{30})$/.test(this._iban) &&
+    return /^XE[0-9]{2}(ETH[0-9A-Z]{13}|[0-9A-Z]{30,31})$/.test(this._iban) &&
         mod9710(iso13616Prepare(this._iban)) === 1;
 };
 
diff --git a/test/iban.isValid.js b/test/iban.isValid.js
index a746b56..31ea0d6 100644
--- a/test/iban.isValid.js
+++ b/test/iban.isValid.js
@@ -19,7 +19,8 @@ var tests = [
     { obj: 'XE81ETHXREGGaVOFYORK', is: false},
     { obj: 'XE7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS', is: true},
     { obj: 'XE7438O073KYGTWWZN0F2WZ0R8PX5ZPPZS', is: false}, // control number is invalid
-    { obj: 'XD7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS', is: false}
+    { obj: 'XD7338O073KYGTWWZN0F2WZ0R8PX5ZPPZS', is: false},
+    { obj: 'XE1222Q908LN1QBBU6XUQSO1OHWJIOS46OO', is: true}
 ];
 
 describe('lib/web3/iban', function () {