diff --git a/htdocs/compta/bank/card.php b/htdocs/compta/bank/card.php
index 1553ae40b92..d4de4e5efb1 100644
--- a/htdocs/compta/bank/card.php
+++ b/htdocs/compta/bank/card.php
@@ -89,7 +89,7 @@ if ($_POST["action"] == 'add')
     $account->proprio 	      = trim($_POST["proprio"]);
     $account->owner_address   = trim($_POST["owner_address"]);
 
-	$account_number 		 = GETPOST('account_number','int');
+	$account_number 		 = GETPOST('account_number','alpha');
 	if ($account_number <= 0) { $account->account_number = ''; } else { $account->account_number = $account_number; }
 	$account->accountancy_journal  = trim($_POST["accountancy_journal"]);