diff --git a/lib/wallet.js b/lib/wallet.js
index 307b03a9..e04aac19 100644
--- a/lib/wallet.js
+++ b/lib/wallet.js
@@ -49,7 +49,7 @@ function _balance (settings, cryptoCode) {
   return fetchWallet(settings, cryptoCode)
     .then(r => r.wallet.balance(r.account, cryptoCode, settings, r.operatorId))
     .then(balance => Promise.all([balance, getOpenBatchCryptoValue(cryptoCode)]))
-    .then(([balance, reservedBalance]) => ({ balance: balance.minus(reservedBalance), reservedBalance, timestamp: Date.now() }))
+    .then(([balance, reservedBalance]) => ({ balance: BN(balance).minus(reservedBalance), reservedBalance, timestamp: Date.now() }))
     .then(r => {
       lastBalance[cryptoCode] = r
       return r