diff --git a/chapter7/admin/authors/index.php b/chapter7/admin/authors/index.php
index 5ef72e3..895fca3 100644
--- a/chapter7/admin/authors/index.php
+++ b/chapter7/admin/authors/index.php
@@ -40,7 +40,7 @@
   exit();
 }
 
-if (isset($_POST['action']) and $_POST['action'] == 'Edit')
+if ((isset($_POST['action'])) && ($_POST['action'] == 'Edit'))
 {
   include $_SERVER['DOCUMENT_ROOT'] . '/includes/db.inc.php';
 
@@ -98,7 +98,7 @@
   exit();
 }
 
-if (isset($_POST['action']) and $_POST['action'] == 'Delete')
+if ((isset($_POST['action'])) && ($_POST['action'] == 'Delete'))
 {
   include $_SERVER['DOCUMENT_ROOT'] . '/includes/db.inc.php';