diff --git a/src/code/sourceLocationTracker.js b/src/code/sourceLocationTracker.js
index 3955bc1f62..b8737ff66f 100644
--- a/src/code/sourceLocationTracker.js
+++ b/src/code/sourceLocationTracker.js
@@ -2,6 +2,7 @@
 var EventManager = require('../lib/eventManager')
 var helper = require('../helpers/traceHelper')
 var SourceMappingDecoder = require('../util/sourceMappingDecoder')
+var util = require('../helpers/util')
 
 /**
  * Process the source code location for the current executing bytecode
@@ -67,7 +68,7 @@ function getSourceMap (address, code, contracts) {
   var isCreation = helper.isContractCreation(address)
   var byteProp = isCreation ? 'bytecode' : 'runtimeBytecode'
   for (var k in contracts) {
-    if (code.replace(/.{64}0029$/, '').indexOf('0x' + contracts[k][byteProp].replace(/.{64}0029$/, '')) === 0) {
+    if (code.replace(util.swarmHashExtraction(), '').indexOf('0x' + contracts[k][byteProp].replace(util.swarmHashExtraction(), '')) === 0) {
       return isCreation ? contracts[k].srcmap : srcmapRuntime(contracts[k])
     }
   }
diff --git a/src/helpers/util.js b/src/helpers/util.js
index c421be2853..e9f51c4167 100644
--- a/src/helpers/util.js
+++ b/src/helpers/util.js
@@ -109,14 +109,21 @@ module.exports = {
   },
 
   /**
-  * Find the call from @args rootCall which contains @args index (recursive)
-  *
-  * @param {Int} index - index of the vmtrace
-  * @param {Object} rootCall  - call tree, built by the trace analyser
-  * @return {Object} - return the call which include the @args index
-  */
+    * Find the call from @args rootCall which contains @args index (recursive)
+    *
+    * @param {Int} index - index of the vmtrace
+    * @param {Object} rootCall  - call tree, built by the trace analyser
+    * @return {Object} - return the call which include the @args index
+    */
   findCall: findCall,
 
+   /**
+    * Find calls path from @args rootCall which leads to @args index (recursive)
+    *
+    * @param {Int} index - index of the vmtrace
+    * @param {Object} rootCall  - call tree, built by the trace analyser
+    * @return {Array} - return the calls path to @args index
+    */
   buildCallPath: buildCallPath,
 
   /**
@@ -129,16 +136,18 @@ module.exports = {
     var ret = ethutil.bufferToHex(ethutil.setLengthLeft(value, 32))
     ret = ethutil.sha3(ret)
     return ethutil.bufferToHex(ret)
+  },
+
+  /**
+    * return a regex which extract the swarmhash from the bytecode.
+    *
+    * @return {RegEx}
+    */
+  swarmHashExtraction: function () {
+    return /a165627a7a72305820([0-9a-f]{64})0029$/
   }
 }
 
-/**
-  * Find calls path from @args rootCall which leads to @args index (recursive)
-  *
-  * @param {Int} index - index of the vmtrace
-  * @param {Object} rootCall  - call tree, built by the trace analyser
-  * @return {Array} - return the calls path to @args index
-  */
 function buildCallPath (index, rootCall) {
   var ret = []
   findCallInternal(index, rootCall, ret)
diff --git a/src/solidity/solidityProxy.js b/src/solidity/solidityProxy.js
index c15bff4940..f7c1a22742 100644
--- a/src/solidity/solidityProxy.js
+++ b/src/solidity/solidityProxy.js
@@ -2,6 +2,7 @@
 var traceHelper = require('../helpers/traceHelper')
 var stateDecoder = require('./stateDecoder')
 var astHelper = require('./astHelper')
+var util = require('../helpers/util')
 
 class SolidityProxy {
   constructor (traceManager, codeManager) {
@@ -136,7 +137,7 @@ function contractNameFromCode (contracts, code, address) {
   var isCreation = traceHelper.isContractCreation(address)
   var byteProp = isCreation ? 'bytecode' : 'runtimeBytecode'
   for (var k in contracts) {
-    if ('0x' + contracts[k][byteProp].replace(/.{64}0029$/, '') === code.replace(/.{64}0029$/, '')) {
+    if ('0x' + contracts[k][byteProp].replace(util.swarmHashExtraction(), '') === code.replace(util.swarmHashExtraction(), '')) {
       return k
     }
   }