diff --git a/lib/compat/wordpress-5.9/get-global-styles-and-settings.php b/lib/compat/wordpress-5.9/get-global-styles-and-settings.php
index b75584b869788..766e56ac84206 100644
--- a/lib/compat/wordpress-5.9/get-global-styles-and-settings.php
+++ b/lib/compat/wordpress-5.9/get-global-styles-and-settings.php
@@ -158,7 +158,7 @@ function wp_get_global_styles_svg_filters() {
 
 		$supports_theme_json = WP_Theme_JSON_Resolver_Gutenberg::theme_has_support();
 
-		$origins = array( 'default', 'theme' );
+		$origins = array( 'default', 'theme', 'custom' );
 		if ( ! $supports_theme_json ) {
 			$origins = array( 'default' );
 		}