diff --git a/lib/web3/function.js b/lib/web3/function.js
index a480c86..9857d5b 100644
--- a/lib/web3/function.js
+++ b/lib/web3/function.js
@@ -65,7 +65,10 @@ SolidityFunction.prototype.extractDefaultBlock = function (args) {
 SolidityFunction.prototype.validateArgs = function (args) {
     var inputArgs = args.filter(function (a) {
       // filter the options object but not arguments that are arrays
-      return !(utils.isObject(a) === true && utils.isArray(a) === false);
+      return !( (utils.isObject(a) === true) &&
+                (utils.isArray(a) === false) &&
+                (utils.isBigNumber(a) === false)
+              );
     });
     if (inputArgs.length !== this._inputTypes.length) {
         throw errors.InvalidNumberOfSolidityArgs();
diff --git a/test/contract.js b/test/contract.js
index a7e7247..77dbfdf 100644
--- a/test/contract.js
+++ b/test/contract.js
@@ -478,6 +478,30 @@ describe('contract', function () {
             contract.send(address, 17, {from: address, gas: 50000, gasPrice: 3000, value: 10000});
         });
 
+        it('should sendTransaction with bigNum param and optional params', function () {
+            var provider = new FakeHttpProvider();
+            var web3 = new Web3(provider);
+            var signature = 'send(address,uint256)';
+            var address = '0x1234567890123456789012345678901234567891';
+            provider.injectValidation(function (payload) {
+                assert.equal(payload.method, 'eth_sendTransaction');
+                assert.deepEqual(payload.params, [{
+                    data: '0x' + sha3(signature).slice(0, 8) +
+                        '0000000000000000000000001234567890123456789012345678901234567891' +
+                        '0000000000000000000000000000000000000000000000000000000000000011' ,
+                    to: address,
+                    from: address,
+                    gas: '0xc350',
+                    gasPrice: '0xbb8',
+                    value: '0x2710'
+                }]);
+            });
+
+            var contract = web3.eth.contract(desc).at(address);
+
+            contract.send(address, new BigNumber(17), {from: address, gas: 50000, gasPrice: 3000, value: 10000});
+        });
+
         it('should explicitly sendTransaction with optional params', function () {
             var provider = new FakeHttpProvider();
             var web3 = new Web3(provider);