diff --git a/migrations/02_singleton_libs.js b/migrations/02_singleton_libs.js
index 65c4a5756..3efccb98f 100644
--- a/migrations/02_singleton_libs.js
+++ b/migrations/02_singleton_libs.js
@@ -45,7 +45,7 @@ module.exports = async function (deployer, network, accounts) {
       makerBalance = await web3.eth.getBalance(res.sender)
     }
 
-    var tx = await web3.eth.sendSignedTransaction(res.rawTx)
+    const tx = await web3.eth.sendSignedTransaction(res.rawTx)
     traceDeploymentTx(tx, web3.utils.fromWei((balance - await web3.eth.getBalance(from)).toString()))
 
   } else {