diff --git a/src/wp-admin/async-upload.php b/src/wp-admin/async-upload.php
index 9a76a6f25d..a50c655c1c 100644
--- a/src/wp-admin/async-upload.php
+++ b/src/wp-admin/async-upload.php
@@ -38,7 +38,7 @@ if ( !current_user_can('upload_files') )
 header('Content-Type: text/html; charset=' . get_option('blog_charset'));
 
 if ( isset( $_REQUEST['action'] ) && 'upload-attachment' === $_REQUEST['action'] ) {
-	include ABSPATH . 'wp-admin/includes/ajax-actions.php';
+	include( ABSPATH . 'wp-admin/includes/ajax-actions.php' );
 
 	send_nosniff_header();
 	nocache_headers();
diff --git a/src/wp-admin/includes/class-wp-upgrader.php b/src/wp-admin/includes/class-wp-upgrader.php
index 4a6c1e4451..77e6e5cae6 100644
--- a/src/wp-admin/includes/class-wp-upgrader.php
+++ b/src/wp-admin/includes/class-wp-upgrader.php
@@ -1393,7 +1393,7 @@ class Core_Upgrader extends WP_Upgrader {
 	function upgrade( $current, $args = array() ) {
 		global $wp_filesystem;
 
-		include ABSPATH . WPINC . '/version.php'; // $wp_version;
+		include( ABSPATH . WPINC . '/version.php' ); // $wp_version;
 
 		$start_time = time();
 
@@ -1537,7 +1537,7 @@ class Core_Upgrader extends WP_Upgrader {
 
 	// Determines if this WordPress Core version should update to $offered_ver or not
 	static function should_update_to_version( $offered_ver /* x.y.z */ ) {
-		include ABSPATH . WPINC . '/version.php'; // $wp_version; // x.y.z
+		include( ABSPATH . WPINC . '/version.php' ); // $wp_version; // x.y.z
 
 		$current_branch = implode( '.', array_slice( preg_split( '/[.-]/', $wp_version  ), 0, 2 ) ); // x.y
 		$new_branch     = implode( '.', array_slice( preg_split( '/[.-]/', $offered_ver ), 0, 2 ) ); // x.y
diff --git a/src/wp-admin/includes/deprecated.php b/src/wp-admin/includes/deprecated.php
index 36b4ca28ca..62b7b7ea80 100644
--- a/src/wp-admin/includes/deprecated.php
+++ b/src/wp-admin/includes/deprecated.php
@@ -1070,7 +1070,7 @@ function wp_update_core($current, $feedback = '') {
 	if ( !empty($feedback) )
 		add_filter('update_feedback', $feedback);
 
-	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	include( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
 	$upgrader = new Core_Upgrader();
 	return $upgrader->upgrade($current);
 
@@ -1093,7 +1093,7 @@ function wp_update_plugin($plugin, $feedback = '') {
 	if ( !empty($feedback) )
 		add_filter('update_feedback', $feedback);
 
-	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	include( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
 	$upgrader = new Plugin_Upgrader();
 	return $upgrader->upgrade($plugin);
 }
@@ -1115,7 +1115,7 @@ function wp_update_theme($theme, $feedback = '') {
 	if ( !empty($feedback) )
 		add_filter('update_feedback', $feedback);
 
-	include ABSPATH . 'wp-admin/includes/class-wp-upgrader.php';
+	include( ABSPATH . 'wp-admin/includes/class-wp-upgrader.php' );
 	$upgrader = new Theme_Upgrader();
 	return $upgrader->upgrade($theme);
 }
diff --git a/src/wp-admin/includes/import.php b/src/wp-admin/includes/import.php
index f01eb8734d..9721dafcad 100644
--- a/src/wp-admin/includes/import.php
+++ b/src/wp-admin/includes/import.php
@@ -119,7 +119,7 @@ function wp_import_handle_upload() {
  * @return array Importers with metadata for each.
  */
 function wp_get_popular_importers() {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 
 	$locale = get_locale();
 	$popular_importers = get_site_transient( 'popular_importers_' . $locale );
diff --git a/src/wp-admin/includes/plugin.php b/src/wp-admin/includes/plugin.php
index 8244592461..442bdce2e9 100644
--- a/src/wp-admin/includes/plugin.php
+++ b/src/wp-admin/includes/plugin.php
@@ -938,7 +938,7 @@ function uninstall_plugin($plugin) {
 
 		define('WP_UNINSTALL_PLUGIN', $file);
 		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . dirname( $file ) );
-		include WP_PLUGIN_DIR . '/' . dirname($file) . '/uninstall.php';
+		include( WP_PLUGIN_DIR . '/' . dirname($file) . '/uninstall.php' );
 
 		return true;
 	}
@@ -950,7 +950,7 @@ function uninstall_plugin($plugin) {
 		unset($uninstallable_plugins);
 
 		wp_register_plugin_realpath( WP_PLUGIN_DIR . '/' . $file );
-		include WP_PLUGIN_DIR . '/' . $file;
+		include( WP_PLUGIN_DIR . '/' . $file );
 
 		add_action( 'uninstall_' . $file, $callable );
 
diff --git a/src/wp-admin/includes/update.php b/src/wp-admin/includes/update.php
index 120a9d4e58..1fe7c40efa 100644
--- a/src/wp-admin/includes/update.php
+++ b/src/wp-admin/includes/update.php
@@ -398,7 +398,7 @@ function wp_theme_update_row( $theme_key, $theme ) {
 }
 
 function maintenance_nag() {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 	global $upgrading;
 	$nag = isset( $upgrading );
 	if ( ! $nag ) {
diff --git a/src/wp-admin/network.php b/src/wp-admin/network.php
index c7b115f6fa..866283f0e6 100644
--- a/src/wp-admin/network.php
+++ b/src/wp-admin/network.php
@@ -153,7 +153,7 @@ function network_step1( $errors = false ) {
 	if ( defined('DO_NOT_UPGRADE_GLOBAL_TABLES') ) {
 		echo '<div class="error"><p><strong>' . __('ERROR:') . '</strong> ' . __( 'The constant DO_NOT_UPGRADE_GLOBAL_TABLES cannot be defined when creating a network.' ) . '</p></div>';
 		echo '</div>';
-		include ( ABSPATH . 'wp-admin/admin-footer.php' );
+		include( ABSPATH . 'wp-admin/admin-footer.php' );
 		die();
 	}
 
diff --git a/src/wp-admin/user-edit.php b/src/wp-admin/user-edit.php
index 2c064bad38..cd548d1b58 100644
--- a/src/wp-admin/user-edit.php
+++ b/src/wp-admin/user-edit.php
@@ -187,7 +187,7 @@ $profileuser = get_user_to_edit($user_id);
 if ( !current_user_can('edit_user', $user_id) )
 	wp_die(__('You do not have permission to edit this user.'));
 
-include (ABSPATH . 'wp-admin/admin-header.php');
+include(ABSPATH . 'wp-admin/admin-header.php');
 ?>
 
 <?php if ( !IS_PROFILE_PAGE && is_super_admin( $profileuser->ID ) && current_user_can( 'manage_network_options' ) ) { ?>
diff --git a/src/wp-includes/class-simplepie.php b/src/wp-includes/class-simplepie.php
index ba6f28dba0..e7281c9e35 100644
--- a/src/wp-includes/class-simplepie.php
+++ b/src/wp-includes/class-simplepie.php
@@ -26,7 +26,7 @@ function wp_simplepie_autoload( $class ) {
 		return;
 
 	$file = ABSPATH . WPINC . '/' . str_replace( '_', '/', $class ) . '.php';
-	include $file;
+	include( $file );
 }
 
 if ( function_exists( 'spl_autoload_register' ) ) {
diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 0e121f875d..59cbd56654 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -48,7 +48,7 @@ require( ABSPATH . WPINC . '/functions.wp-styles.php' );
  * @param object $scripts WP_Scripts object.
  */
 function wp_default_scripts( &$scripts ) {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 
 	$develop_src = false !== strpos( $wp_version, '-src' );
 
@@ -557,7 +557,7 @@ function wp_default_scripts( &$scripts ) {
  * @param object $styles
  */
 function wp_default_styles( &$styles ) {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 
 	if ( ! defined( 'SCRIPT_DEBUG' ) )
 		define( 'SCRIPT_DEBUG', false !== strpos( $wp_version, '-src' ) );
diff --git a/src/wp-includes/update.php b/src/wp-includes/update.php
index 3639907b79..ee7434fffd 100644
--- a/src/wp-includes/update.php
+++ b/src/wp-includes/update.php
@@ -25,7 +25,7 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
 		return;
 
 	global $wpdb, $wp_local_package;
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 	$php_version = phpversion();
 
 	$current = get_site_transient( 'update_core' );
@@ -183,7 +183,7 @@ function wp_version_check( $extra_stats = array(), $force_check = false ) {
  * @return mixed Returns null if update is unsupported. Returns false if check is too soon.
  */
 function wp_update_plugins( $extra_stats = array() ) {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 
 	if ( defined('WP_INSTALLING') )
 		return false;
@@ -322,7 +322,7 @@ function wp_update_plugins( $extra_stats = array() ) {
  * @return mixed Returns null if update is unsupported. Returns false if check is too soon.
  */
 function wp_update_themes( $extra_stats = array() ) {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 
 	if ( defined( 'WP_INSTALLING' ) )
 		return false;
@@ -550,7 +550,7 @@ function wp_get_update_data() {
 }
 
 function _maybe_update_core() {
-	include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+	include( ABSPATH . WPINC . '/version.php' ); // include an unmodified $wp_version
 
 	$current = get_site_transient( 'update_core' );