diff --git a/src/main/java/net/fortuna/ical4j/model/component/VFreeBusy.java b/src/main/java/net/fortuna/ical4j/model/component/VFreeBusy.java
index 0c5076961..84c28e2b0 100644
--- a/src/main/java/net/fortuna/ical4j/model/component/VFreeBusy.java
+++ b/src/main/java/net/fortuna/ical4j/model/component/VFreeBusy.java
@@ -328,6 +328,9 @@ public VFreeBusy(final VFreeBusy request, final List<CalendarComponent> componen
             throw new ValidationException("Missing required property", cve);
         }
 
+        // ensure the request is valid..
+        request.validate();
+
         final Optional<Duration> duration = request.getProperties().getFirst(DURATION);
         
         // 4.8.2.4 Date/Time Start: