diff --git a/index.js b/index.js
index 730cc52..fbbd360 100644
--- a/index.js
+++ b/index.js
@@ -95,7 +95,7 @@ btns.forEach((btn) => {
         : (display.innerText = outcome);
     }
     function zeroDivedByZero(display, outcome) {
-      isNaN(outcome)
+      Number.isNaN(outcome)
       ? (display.innerText = "Invalid format: You cannot divided by zero" )
       : (display.innerText = outcome)
     }