diff --git a/maths/factorial.js b/maths/factorial.js
index 211a5c741..647a3e225 100644
--- a/maths/factorial.js
+++ b/maths/factorial.js
@@ -48,6 +48,6 @@ function calcFactorial (num) {
 }
 
 // Run `factorial` Function to find average of a list of numbers.
-/* global alert, prompt */
+/* global prompt */
 var num = prompt('Enter a number: ')
 console.log(calcFactorial(num))