diff --git a/src/config.js b/src/config.js
index 852c45e..4393e02 100644
--- a/src/config.js
+++ b/src/config.js
@@ -20,8 +20,8 @@ module.exports = {
   rewardAccount: process.env.REWARD_ACCOUNT,
   gasLimits: {
     [jobType.TORNADO_WITHDRAW]: 350000,
-    [jobType.MINING_REWARD]: 800000,
-    [jobType.MINING_WITHDRAW]: 800000,
+    [jobType.MINING_REWARD]: 455000,
+    [jobType.MINING_WITHDRAW]: 400000,
   },
-  minimumBalance: 1000000000000000000,
+  minimumBalance: '1000000000000000000',
 }
diff --git a/src/healthWatcher.js b/src/healthWatcher.js
index 55f2ed3..6a8f02f 100644
--- a/src/healthWatcher.js
+++ b/src/healthWatcher.js
@@ -14,7 +14,7 @@ async function main() {
     const balance = await web3.eth.getBalance(address)
 
     if (toBN(balance).lt(toBN(minimumBalance))) {
-      throw new Error(`Not enough balance, less than ${fromWei(minimumBalance.toString())} ETH`)
+      throw new Error(`Not enough balance, less than ${fromWei(minimumBalance)} ETH`)
     }
 
     await redis.hset('health', { status: true, error: '' })