diff --git a/lib/core/modules/coderunner/codeRunner.js b/lib/core/modules/coderunner/codeRunner.js
index 2761319d..e4004da4 100644
--- a/lib/core/modules/coderunner/codeRunner.js
+++ b/lib/core/modules/coderunner/codeRunner.js
@@ -1,6 +1,8 @@
 const RunCode = require('./runCode.js');
 const Utils = require('../../../utils/utils');
 
+const WEB3_INVALID_RESPONSE_ERROR = 'Invalid JSON RPC response';
+
 class CodeRunner {
   constructor(options) {
     this.config = options.config;
@@ -94,7 +96,7 @@ class CodeRunner {
       cb(null, value);
     } catch (error) {
       // Improve error message when there's no connection to node
-      if (error.message.indexOf('Invalid JSON RPC response') !== -1) {
+      if (error.message.indexOf(WEB3_INVALID_RESPONSE_ERROR) !== -1) {
         error.message += '. Are you connected to an Ethereum node?';
       }