diff --git a/allianceauth/static/allianceauth/js/timerboard.js b/allianceauth/static/allianceauth/js/timerboard.js
index 2e1ce5c5..22ec0383 100644
--- a/allianceauth/static/allianceauth/js/timerboard.js
+++ b/allianceauth/static/allianceauth/js/timerboard.js
@@ -8,9 +8,9 @@ $(document).ready(() => {
     inputAbsoluteTime.parent().prev('label').hide();
     inputCountdown.prop('required', true);
 
-    $('input#id_absolute_checkbox').change(function () {
-        if ($(this).prop('checked')) {
-            // check box enabled
+    $('input#id_absolute_checkbox').change((event) => {
+        if ($(event.target).prop('checked')) {
+            // Checkbox is checked
             inputAbsoluteTime.parent().show();
             inputAbsoluteTime.parent().prev('label').show();
             inputCountdown.parent().hide();