diff --git a/lib/cmds/blockchain/blockchain.js b/lib/cmds/blockchain/blockchain.js
index 187f3c4e..1e6f5396 100644
--- a/lib/cmds/blockchain/blockchain.js
+++ b/lib/cmds/blockchain/blockchain.js
@@ -193,7 +193,7 @@ Blockchain.prototype.checkPathLength = function() {
 
 Blockchain.prototype.isClientInstalled = function(callback) {
   let versionCmd = this.client.determineVersionCommand();
-  this.runCommand(versionCmd, {}, (err, stdout, stderr) => {
+  this.runCommand(versionCmd, {}, (err, stdout, _stderr) => {
     if (err || !stdout || stdout.indexOf("not found") >= 0) {
       return callback('Geth not found');
     }