diff --git a/mod/data/preset.php b/mod/data/preset.php
index bd3142839fc..e36af7bdf57 100644
--- a/mod/data/preset.php
+++ b/mod/data/preset.php
@@ -216,7 +216,7 @@ if (optional_param('sesskey', false, PARAM_BOOL) && confirm_sesskey()) {
         } else if ($action == 'finishimport') {
             $overwritesettings = optional_param('overwritesettings', false, PARAM_BOOL);
             if (!$fullname) {
-                $presetdir = $CFG->tempdir.'/forms/'.required_param('directory', PARAM_ALPHANUMEXT);
+                $presetdir = $CFG->tempdir.'/forms/'.required_param('directory', PARAM_FILE);
                 if (!file_exists($presetdir) || !is_dir($presetdir)) {
                     print_error('cannotimport');
                 }