diff --git a/src/elements/calendar/calendar.spec.ts b/src/elements/calendar/calendar.spec.ts
index 642bf653e6..79793cb3c0 100644
--- a/src/elements/calendar/calendar.spec.ts
+++ b/src/elements/calendar/calendar.spec.ts
@@ -256,7 +256,7 @@ describe(`sbb-calendar`, () => {
     });
 
     it('opens month view with current date', async () => {
-      element.selected = undefined;
+      element.selected = null;
       element.now = '2022-08-15';
       element.view = 'month';
       await waitForLitRender(element);