diff --git a/constance/static/admin/js/constance.js b/constance/static/admin/js/constance.js
index bea4ba6..d828592 100644
--- a/constance/static/admin/js/constance.js
+++ b/constance/static/admin/js/constance.js
@@ -6,17 +6,17 @@
         $('#content-main').on('click', '.reset-link', function(e) {
             e.preventDefault();
 
-            var field_selector = this.dataset.fieldId.replace(/ /g, "\\ ") 
-            var field = $('#' + field_selector);
-            var fieldType = this.dataset.fieldType;
+            const field_selector = this.dataset.fieldId.replace(/ /g, "\\ ")
+            const field = $('#' + field_selector);
+            const fieldType = this.dataset.fieldType;
 
             if (fieldType === 'checkbox') {
                 field.prop('checked', this.dataset.default === 'true');
             } else if (fieldType === 'date') {
-                var defaultDate = new Date(this.dataset.default * 1000);
+                const defaultDate = new Date(this.dataset.default * 1000);
                 $('#' + this.dataset.fieldId).val(defaultDate.strftime(get_format('DATE_INPUT_FORMATS')[0]));
             } else if (fieldType === 'datetime') {
-                var defaultDate = new Date(this.dataset.default * 1000);
+                const defaultDate = new Date(this.dataset.default * 1000);
                 $('#' + this.dataset.fieldId + '_0').val(defaultDate.strftime(get_format('DATE_INPUT_FORMATS')[0]));
                 $('#' + this.dataset.fieldId + '_1').val(defaultDate.strftime(get_format('TIME_INPUT_FORMATS')[0]));
             } else {