diff --git a/src/treeWatcher.js b/src/treeWatcher.js
index f48d8b7..f2038bc 100644
--- a/src/treeWatcher.js
+++ b/src/treeWatcher.js
@@ -18,6 +18,7 @@ const web3 = new Web3(
 const MinerABI = require('../abis/mining.abi.json')
 let contract
 
+// eslint-disable-next-line no-unused-vars
 let tree, eventSubscription, blockSubscription
 
 // todo handle the situation when we have two rewards in one block