diff --git a/phpBB/includes/ucp/ucp_register.php b/phpBB/includes/ucp/ucp_register.php
index 88f3343f6f..76e02fd45b 100644
--- a/phpBB/includes/ucp/ucp_register.php
+++ b/phpBB/includes/ucp/ucp_register.php
@@ -56,7 +56,7 @@ class ucp_register
 		{
 			$use_lang = ($change_lang) ? basename($change_lang) : basename($user_lang);
 
-			if (file_exists($user->lang_path . $use_lang . '/'))
+			if (!validate_language($use_lang))
 			{
 				if ($change_lang)
 				{