diff --git a/carddav/carddav.go b/carddav/carddav.go
index 68d3244..6a52400 100644
--- a/carddav/carddav.go
+++ b/carddav/carddav.go
@@ -100,10 +100,11 @@ type AddressBookMultiGet struct {
 }
 
 type AddressObject struct {
-	Path    string
-	ModTime time.Time
-	ETag    string
-	Card    vcard.Card
+	Path          string
+	ModTime       time.Time
+	ContentLength int64
+	ETag          string
+	Card          vcard.Card
 }
 
 //SyncQuery is the query struct represents a sync-collection request
diff --git a/carddav/server.go b/carddav/server.go
index ea474d6..93bf5f4 100644
--- a/carddav/server.go
+++ b/carddav/server.go
@@ -441,6 +441,11 @@ func (b *backend) propfindAddressObject(ctx context.Context, propfind *internal.
 		},
 	}
 
+	if ao.ContentLength > 0 {
+		props[internal.GetContentLengthName] = func(*internal.RawXMLValue) (interface{}, error) {
+			return &internal.GetContentLength{Length: ao.ContentLength}, nil
+		}
+	}
 	if !ao.ModTime.IsZero() {
 		props[internal.GetLastModifiedName] = func(*internal.RawXMLValue) (interface{}, error) {
 			return &internal.GetLastModified{LastModified: internal.Time(ao.ModTime)}, nil