--- /Users/rich/Desktop/uc_credit_orig.module	2008-04-18 11:31:06.000000000 +0100
+++ uc_credit_new.module	2008-04-18 11:30:55.000000000 +0100
@@ -729,7 +729,7 @@
     '#default_value' => $default_num,
     '#attributes' => array('autocomplete' => 'off'),
     '#size' => 20,
-    '#maxlength' => 16,
+    '#maxlength' => 18,
   );
 
   $form['cc_exp_month'] = uc_select_month(t('Expiration Month'), $order->payment_details['cc_exp_month']);