diff --git a/crates/caldav/src/calendar/prop.rs b/crates/caldav/src/calendar/prop.rs
index a007a4d..879f032 100644
--- a/crates/caldav/src/calendar/prop.rs
+++ b/crates/caldav/src/calendar/prop.rs
@@ -9,7 +9,7 @@ pub struct SupportedCalendarComponent {
 
 #[derive(Debug, Clone, XmlDeserialize, XmlSerialize, PartialEq)]
 pub struct SupportedCalendarComponentSet {
-    #[xml(flatten)]
+    #[xml(ns = "rustical_dav::namespace::NS_CALDAV", flatten)]
     pub comp: Vec<SupportedCalendarComponent>,
 }