diff --git a/calculator/calculator.js b/calculator/calculator.js
index d45cc64..f8c10c9 100644
--- a/calculator/calculator.js
+++ b/calculator/calculator.js
@@ -21,7 +21,6 @@ const power = function(a, b) {
 };
 
 const factorial = function(n) {
-  if (n === 0) return 1;
   let product = 1;
   for (let i = n; i > 0; i--) {
     product *= i;