diff --git a/readme.txt b/readme.txt
index 6460e47..b2835e9 100644
--- a/readme.txt
+++ b/readme.txt
@@ -71,6 +71,9 @@ SiteOrigin Premium includes access to our professional email support service, pe
 
 == Changelog ==
 
+= 1.5.5 - 30 September 2022 =
+* Added a check to ensure WP Filesystem is setup. 
+
 = 1.5.4 - 28 September 2022 =
 * Developer: Introduced definable Custom CSS file name and location using `siteorigin_custom_css_file` and `siteorigin_css_enqueue_css`.
 
diff --git a/so-css.php b/so-css.php
index 10cfe94..e473c51 100644
--- a/so-css.php
+++ b/so-css.php
@@ -31,6 +31,12 @@ function __construct() {
 		
 		// Main header actions
 		add_action( 'plugins_loaded', array( $this, 'set_plugin_textdomain' ) );
+
+		global $wp_filesystem;
+		if ( ! class_exists( 'wp_filesystem' ) ) {
+			require_once( ABSPATH . '/wp-admin/includes/file.php' );
+			WP_Filesystem();
+		}
 		
 		// Priority 20 is necessary to ensure our CSS takes precedence.
 		add_action( 'wp_head', array( $this, 'enqueue_css' ), 20 );