diff --git a/src/index.ts b/src/index.ts
index 4e3587b..83efb50 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -40,6 +40,7 @@ const calendarOptions: CalendarOptions = {
         h('a', { href: ical_link }, ' [iCal 📅]')
       );
     }
+    return true;
   },
   eventContent: (arg: EventContentArg, h: typeof createElement) => {
     if (arg.view.type != 'resourceTimeline') {
@@ -66,6 +67,7 @@ const calendarOptions: CalendarOptions = {
         )
       );
     }
+    return true;
   },
 };