diff --git a/includes/fs-essential-functions.php b/includes/fs-essential-functions.php
index 84ffcbe0..af13f4c9 100644
--- a/includes/fs-essential-functions.php
+++ b/includes/fs-essential-functions.php
@@ -10,6 +10,9 @@
 	 * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3
 	 * @since       1.1.5
 	 */
+    if ( ! defined( 'ABSPATH' ) ) {
+        exit;
+    }
 
 	if ( ! function_exists( 'fs_normalize_path' ) ) {
 		if ( function_exists( 'wp_normalize_path' ) ) {
diff --git a/includes/managers/class-fs-debug-manager.php b/includes/managers/class-fs-debug-manager.php
index 5364712d..948d3546 100644
--- a/includes/managers/class-fs-debug-manager.php
+++ b/includes/managers/class-fs-debug-manager.php
@@ -6,6 +6,9 @@
      * @package   Freemius
      * @since     2.6.2
      */
+    if ( ! defined( 'ABSPATH' ) ) {
+        exit;
+    }
 
     class FS_DebugManager {
 
diff --git a/templates/checkout.php b/templates/checkout.php
index 00f1002b..909dc8c6 100644
--- a/templates/checkout.php
+++ b/templates/checkout.php
@@ -5,7 +5,9 @@
 	 * @license     https://www.gnu.org/licenses/gpl-3.0.html GNU General Public License Version 3
 	 * @since       2.9.0
 	 */
-
+    if ( ! defined( 'ABSPATH' ) ) {
+        exit;
+    }
 	/**
 	 * @var array    $VARS
 	 * @var Freemius $fs