diff --git a/htdocs/accountancy/admin/card.php b/htdocs/accountancy/admin/card.php
index 02b95cfd043..535463822db 100644
--- a/htdocs/accountancy/admin/card.php
+++ b/htdocs/accountancy/admin/card.php
@@ -41,7 +41,7 @@ $ref = GETPOST('ref', 'alpha');
 $rowid = GETPOST('rowid', 'int');
 $cancel = GETPOST('cancel', 'alpha');
 
-$account_number = GETPOST('account_number', 'string');
+$account_number = GETPOST('account_number', 'alphanohtml');
 $label = GETPOST('label', 'alpha');
 
 // Security check