diff --git a/samples/js-modern-calendar/src/webparts/modernCalendar/ModernCalendarWebPart.ts b/samples/js-modern-calendar/src/webparts/modernCalendar/ModernCalendarWebPart.ts
index 1004b17e2..5efa55417 100644
--- a/samples/js-modern-calendar/src/webparts/modernCalendar/ModernCalendarWebPart.ts
+++ b/samples/js-modern-calendar/src/webparts/modernCalendar/ModernCalendarWebPart.ts
@@ -453,10 +453,10 @@ export default class ModernCalendarWebPart extends BaseClientSideWebPart<IModern
               this.properties.site
             ).then((response3) => {
               var col: IPropertyPaneDropdownOption[] = [];
-              for (var _key in response3.value) {
+              for (var _innerKey in response3.value) {
                 col.push({
-                  key: response3.value[_key]["InternalName"],
-                  text: response3.value[_key]["Title"],
+                  key: response3.value[_innerKey]["InternalName"],
+                  text: response3.value[_innerKey]["Title"],
                 });
               }
               this._columnOptions = col;