diff --git a/inc/DAVResource.php b/inc/DAVResource.php
index 4f0d5110..0a4d2a0f 100644
--- a/inc/DAVResource.php
+++ b/inc/DAVResource.php
@@ -1649,7 +1649,7 @@ EOQRY;
       case 'DAV::add-member':
         if ( ! $this->_is_collection ) return false;
         if ( isset($c->post_add_member) && $c->post_add_member === false ) return false;
-        $reply->DAVElement( $prop, 'add-member', $reply->href(ConstructURL(DeconstructURL($this->url())).'?add-member') );
+        $reply->DAVElement( $prop, 'add-member', $reply->href(ConstructURL(DeconstructURL($this->url())).'?add_member') );
         break;
 
       // Empty tag responses.
diff --git a/inc/caldav-PUT-vcalendar.php b/inc/caldav-PUT-vcalendar.php
index 65251ab7..efb8131d 100644
--- a/inc/caldav-PUT-vcalendar.php
+++ b/inc/caldav-PUT-vcalendar.php
@@ -86,4 +86,7 @@ write_resource( $dav_resource, $request->raw_post, $collection, $session->user_n
 
 if ( isset($etag) ) header(sprintf('ETag: "%s"', $etag) );
 
+// make sure to return a Location header when add-member was used
+if ( $add_member ) header('Location: '.$c->protocol_server_port_script.$request->path);
+
 $request->DoResponse( ($dav_resource->Exists() ? 204 : 201) );