diff --git a/public/auth/oauth2/login.php b/public/auth/oauth2/login.php
index 20b6c6d234c..c2d39169d30 100644
--- a/public/auth/oauth2/login.php
+++ b/public/auth/oauth2/login.php
@@ -25,7 +25,7 @@
 require_once('../../config.php');
 
 $issuerid = required_param('id', PARAM_INT);
-$wantsurl = optional_param('wantsurl', '', PARAM_URL);
+$wantsurl = optional_param('wantsurl', '', PARAM_LOCALURL);
 
 $PAGE->set_context(context_system::instance());
 $PAGE->set_url(new moodle_url('/auth/oauth2/login.php', ['id' => $issuerid]));