diff --git a/09_Day_Higher_order_functions/09_day_higher_order_functions.md b/09_Day_Higher_order_functions/09_day_higher_order_functions.md
index 3c8a619..ed6e2a1 100644
--- a/09_Day_Higher_order_functions/09_day_higher_order_functions.md
+++ b/09_Day_Higher_order_functions/09_day_higher_order_functions.md
@@ -97,7 +97,7 @@ const sumArray = arr => {
   const callBack = function(element) {
     sum += element
   }
-  numbers.forEach(callback)
+  arr.forEach(callBack)
   return sum
 
 }