diff --git a/modules/customer/includes/commerce_customer.checkout_pane.inc b/modules/customer/includes/commerce_customer.checkout_pane.inc
index b148b3d..2f8f917 100644
--- a/modules/customer/includes/commerce_customer.checkout_pane.inc
+++ b/modules/customer/includes/commerce_customer.checkout_pane.inc
@@ -228,6 +228,15 @@ function commerce_customer_profile_pane_checkout_form_validate($form, &$form_sta
   // Notify field widgets to validate their data.
   field_attach_form_validate('commerce_customer_profile', $profile, $form[$checkout_pane['pane_id']], $form_state);
 
+  // If there were any errors, let the chckout proces know about them by
+  // returning FALSE.
+  $errors = form_get_errors();
+  foreach ($errors as $field => $error) {
+    if (substr($field, 0, 26) == 'customer_profile_billing][') {
+      return FALSE;
+    }
+  }
+
   return TRUE;
 }