diff --git a/server/index.js b/server/index.js
index 6da22c6d..e385656d 100644
--- a/server/index.js
+++ b/server/index.js
@@ -23,7 +23,7 @@ app.get('/balance/:address', (req, res) => {
 app.post('/send', (req, res) => {
   const {sender, recipient, amount} = req.body;
   balances[sender] -= amount;
-  balances[recipient] = (balances[recipient] || 0) + +amount;
+  balances[recipient] = (balances[recipient] || 0) + Number(amount);
   res.send({ balance: balances[sender] });
 });