diff --git a/common.php b/common.php
index df529a4a..458225ef 100644
--- a/common.php
+++ b/common.php
@@ -87,7 +87,7 @@ const TFS_FIRST = TFS_02;
 const TFS_LAST = TFS_03;
 
 // other definitions
-const ACCOUNT_NUMBER_LENGTH = 10;
+const ACCOUNT_NUMBER_LENGTH = 8;
 
 session_save_path(SYSTEM . 'php_sessions');
 session_start();