diff --git a/includes/class-wc-cart.php b/includes/class-wc-cart.php
index b00ae11445d..65d86b28300 100644
--- a/includes/class-wc-cart.php
+++ b/includes/class-wc-cart.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * WooCommerce cart
  *
diff --git a/includes/class-wc-checkout.php b/includes/class-wc-checkout.php
index e8c1721326b..83a36fadbf3 100644
--- a/includes/class-wc-checkout.php
+++ b/includes/class-wc-checkout.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Checkout
  *
diff --git a/includes/class-wc-comments.php b/includes/class-wc-comments.php
index aacffb5c8c1..66fc4654f3f 100644
--- a/includes/class-wc-comments.php
+++ b/includes/class-wc-comments.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Comments
  *
@@ -10,11 +15,6 @@
  * @category Class
  * @author   WooThemes
  */
-
-if ( ! defined( 'ABSPATH' ) ) {
-	exit;
-}
-
 class WC_Comments {
 
 	/**
diff --git a/includes/class-wc-countries.php b/includes/class-wc-countries.php
index 920b298c5b8..8995fa0deb4 100644
--- a/includes/class-wc-countries.php
+++ b/includes/class-wc-countries.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * WooCommerce countries
  *
diff --git a/includes/class-wc-coupon.php b/includes/class-wc-coupon.php
index 127ed217b47..465506d5b74 100644
--- a/includes/class-wc-coupon.php
+++ b/includes/class-wc-coupon.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * WooCommerce coupons
  *
diff --git a/includes/class-wc-customer.php b/includes/class-wc-customer.php
index 2ebe188a588..6ec7ad47221 100644
--- a/includes/class-wc-customer.php
+++ b/includes/class-wc-customer.php
@@ -1,4 +1,10 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
+
 /**
  * Customer
  *
diff --git a/includes/class-wc-emails.php b/includes/class-wc-emails.php
index 0eb12e95797..2e5e5b84793 100644
--- a/includes/class-wc-emails.php
+++ b/includes/class-wc-emails.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Transactional Emails Controller
  *
diff --git a/includes/class-wc-integrations.php b/includes/class-wc-integrations.php
index 01188594dfa..e292e7382fc 100644
--- a/includes/class-wc-integrations.php
+++ b/includes/class-wc-integrations.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * WooCommerce Integrations class
  *
diff --git a/includes/class-wc-logger.php b/includes/class-wc-logger.php
index 94c3b156e88..af43997a41f 100644
--- a/includes/class-wc-logger.php
+++ b/includes/class-wc-logger.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Allows log files to be written to for debugging purposes
  *
diff --git a/includes/class-wc-order-factory.php b/includes/class-wc-order-factory.php
index 831cde5a6b7..8fb5aa79d7e 100644
--- a/includes/class-wc-order-factory.php
+++ b/includes/class-wc-order-factory.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Order Factory Class
  *
diff --git a/includes/class-wc-order-item-meta.php b/includes/class-wc-order-item-meta.php
index 001050c9d33..522ec449aeb 100644
--- a/includes/class-wc-order-item-meta.php
+++ b/includes/class-wc-order-item-meta.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Order Item Meta
  *
diff --git a/includes/class-wc-order-refund.php b/includes/class-wc-order-refund.php
index c6ed1d59f78..b3ab4ce106e 100644
--- a/includes/class-wc-order-refund.php
+++ b/includes/class-wc-order-refund.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Order refund
  *
diff --git a/includes/class-wc-order.php b/includes/class-wc-order.php
index 2ce149d20ac..fe4c2bdb70e 100644
--- a/includes/class-wc-order.php
+++ b/includes/class-wc-order.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Order
  *
diff --git a/includes/class-wc-payment-gateways.php b/includes/class-wc-payment-gateways.php
index 9a7614358d6..396507efc18 100644
--- a/includes/class-wc-payment-gateways.php
+++ b/includes/class-wc-payment-gateways.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * WooCommerce Payment Gateways class
  *
diff --git a/includes/class-wc-product-factory.php b/includes/class-wc-product-factory.php
index 078d6ea39be..8d99e7e5172 100644
--- a/includes/class-wc-product-factory.php
+++ b/includes/class-wc-product-factory.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Product Factory Class
  *
diff --git a/includes/class-wc-shortcodes.php b/includes/class-wc-shortcodes.php
index d15039ba786..6afed725e26 100644
--- a/includes/class-wc-shortcodes.php
+++ b/includes/class-wc-shortcodes.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * WC_Shortcodes class
  *
diff --git a/includes/class-wc-tax.php b/includes/class-wc-tax.php
index 0f6a3c86375..fd38cfce2d7 100644
--- a/includes/class-wc-tax.php
+++ b/includes/class-wc-tax.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Performs tax calculations and loads tax rates
  *
diff --git a/includes/class-wc-template-loader.php b/includes/class-wc-template-loader.php
index b0b75639a00..576ddbb2ffe 100644
--- a/includes/class-wc-template-loader.php
+++ b/includes/class-wc-template-loader.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Template Loader
  *
diff --git a/includes/class-wc-validation.php b/includes/class-wc-validation.php
index 15d83b5cf8d..0fbca96ef2b 100644
--- a/includes/class-wc-validation.php
+++ b/includes/class-wc-validation.php
@@ -1,4 +1,9 @@
 <?php
+
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Contains Validation functions
  *
diff --git a/includes/wc-page-functions.php b/includes/wc-page-functions.php
index 747b8100630..c580e54be13 100644
--- a/includes/wc-page-functions.php
+++ b/includes/wc-page-functions.php
@@ -10,6 +10,10 @@
  * @version     2.1.0
  */
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Replace a page title with the endpoint title.
  * @param  string $title
diff --git a/includes/wc-product-functions.php b/includes/wc-product-functions.php
index 6be2ff99888..e81f99584f2 100644
--- a/includes/wc-product-functions.php
+++ b/includes/wc-product-functions.php
@@ -10,6 +10,10 @@
  * @version  2.3.0
  */
 
+if ( ! defined( 'ABSPATH' ) ) {
+	exit; // Exit if accessed directly
+}
+
 /**
  * Main function for returning products, uses the WC_Product_Factory class.
  *