diff --git a/other/update_unicode_data.php b/other/update_unicode_data.php
index b433ff5e4b..65895bbe3d 100644
--- a/other/update_unicode_data.php
+++ b/other/update_unicode_data.php
@@ -54,7 +54,7 @@
 }
 
 // 4. Get some more stuff we need.
-require_once '/vendor/autoload.php';
+require_once $boarddir . '/vendor/autoload.php';
 SMF\Config::$boarddir = $boarddir;
 SMF\Config::$sourcedir = $sourcedir;