diff --git a/src/algorithms/math/factorial/factorial.js b/src/algorithms/math/factorial/factorial.js
index 6c717d05..e725c484 100644
--- a/src/algorithms/math/factorial/factorial.js
+++ b/src/algorithms/math/factorial/factorial.js
@@ -5,7 +5,7 @@
 export default function factorial(number) {
   let result = 1;
 
-  for (let i = 2; i <= number; i += 1) {
+  for (let i = 2; i <= number; i ++) {
     result *= i;
   }