diff --git a/inc/ui/collection-edit.php b/inc/ui/collection-edit.php
index 9e672295..3e66e3ca 100644
--- a/inc/ui/collection-edit.php
+++ b/inc/ui/collection-edit.php
@@ -108,9 +108,10 @@ if ( $can_write_collection && $editor->IsSubmit() ) {
       $path = $editor->Value('dav_name');
       $user_no = $editor->Value('user_no');
       $username = $editor->Value('username');
+      param_to_global('mode');
       include_once('caldav-PUT-functions.php');
       controlRequestContainer( $username, $user_no, $path, false, ($publicly_readable == 'on' ? true : false));
-      import_collection( $ics, $user_no, $path, $session->user_no );
+      import_collection( $ics, $user_no, $path, $session->user_no, ($mode == 'append') );
       $c->messages[] = sprintf(translate('Calendar "%s" was loaded from file.'), $path);
     }
     else {