diff --git a/caldav/caldav.go b/caldav/caldav.go
index 9d5ca11..014e257 100644
--- a/caldav/caldav.go
+++ b/caldav/caldav.go
@@ -117,8 +117,9 @@ type CalendarMultiGet struct {
 }
 
 type CalendarObject struct {
-	Path    string
-	ModTime time.Time
-	ETag    string
-	Data    *ical.Calendar
+	Path          string
+	ModTime       time.Time
+	ContentLength int64
+	ETag          string
+	Data          *ical.Calendar
 }
diff --git a/caldav/server.go b/caldav/server.go
index f713174..b7273f5 100644
--- a/caldav/server.go
+++ b/caldav/server.go
@@ -465,6 +465,11 @@ func (b *backend) propfindCalendarObject(ctx context.Context, propfind *internal
 		},
 	}
 
+	if co.ContentLength > 0 {
+		props[internal.GetContentLengthName] = func(*internal.RawXMLValue) (interface{}, error) {
+			return &internal.GetContentLength{Length: co.ContentLength}, nil
+		}
+	}
 	if !co.ModTime.IsZero() {
 		props[internal.GetLastModifiedName] = func(*internal.RawXMLValue) (interface{}, error) {
 			return &internal.GetLastModified{LastModified: internal.Time(co.ModTime)}, nil