diff --git a/htdocs/accountancy/admin/export.php b/htdocs/accountancy/admin/export.php
index eccb9b0c06f..03538b759e7 100644
--- a/htdocs/accountancy/admin/export.php
+++ b/htdocs/accountancy/admin/export.php
@@ -41,7 +41,7 @@ if (empty($user->rights->accounting->chartofaccount))
 	accessforbidden();
 }
 
-$action = GETPOST('action', 'alpha');
+$action = GETPOST('action', 'aZ09');
 
 // Parameters ACCOUNTING_EXPORT_*
 $main_option = array (