1 files changed, 5 insertions, 3 deletions
diff --git a/lib/abi.js b/lib/abi.js
index c896ab28a..21580347d 100644
--- a/lib/abi.js
+++ b/lib/abi.js
@@ -32,6 +32,9 @@ BigNumber.config({ ROUNDING_MODE: BigNumber.ROUND_DOWN });
 
 var ETH_PADDING = 32;
 
+/// method signature length in bytes
+var ETH_METHOD_SIGNATURE_LENGTH = 4;
+
 /// Finds first index of array element matching pattern
 /// @param array
 /// @param callback pattern
@@ -389,11 +392,10 @@ var outputParser = function (json) {
     return parser;
 };
 
-/// @param json abi for contract
 /// @param method name for which we want to get method signature
 /// @returns (promise) contract method signature for method with given name
-var methodSignature = function (json, name) {
-    return web3.sha3(web3.fromAscii(name));
+var methodSignature = function (name) {
+    return web3.sha3(web3.fromAscii(name)).slice(0, 2 + ETH_METHOD_SIGNATURE_LENGTH * 2);
 };
 
 module.exports = {