diff --git a/1-js/05-data-types/04-array/5-array-input-sum/solution.md b/1-js/05-data-types/04-array/5-array-input-sum/solution.md
index cbdfbded8c..75bd683b55 100644
--- a/1-js/05-data-types/04-array/5-array-input-sum/solution.md
+++ b/1-js/05-data-types/04-array/5-array-input-sum/solution.md
@@ -20,6 +20,7 @@ function sumInput() {
   for (let number of numbers) {
     sum += number;
   }
+  return sum;
 }
 
 alert( sumInput() );