diff --git a/exercises/03_async/nestedCallbacks.js b/exercises/03_async/nestedCallbacks.js
index d9c0110..cd3fcc1 100644
--- a/exercises/03_async/nestedCallbacks.js
+++ b/exercises/03_async/nestedCallbacks.js
@@ -12,7 +12,7 @@ getInput('enter base currency', (err, base) => {
 	checkValidCurrencyCode(base, err => {
 		if (err) {
 			console.log(err.message)
-			process.exit
+			process.exit()
 		}
 		getData(`http://api.fixer.io/latest?base=${base}`, (err, data) => {
 			if (err) {