diff --git a/src/wp-includes/class-wp-theme-json-resolver.php b/src/wp-includes/class-wp-theme-json-resolver.php
index 42ad830c73..1efb8a4c8a 100644
--- a/src/wp-includes/class-wp-theme-json-resolver.php
+++ b/src/wp-includes/class-wp-theme-json-resolver.php
@@ -342,7 +342,7 @@ class WP_Theme_JSON_Resolver {
 				array(
 					'post_content' => '{"version": ' . WP_Theme_JSON::LATEST_SCHEMA . ', "isGlobalStylesUserThemeJSON": true }',
 					'post_status'  => 'publish',
-					'post_title'   => __( 'Custom Styles' ),
+					'post_title'   => 'Custom Styles', // Do not make string translatable, see https://core.trac.wordpress.org/ticket/54518.
 					'post_type'    => $post_type_filter,
 					'post_name'    => sprintf( 'wp-global-styles-%s', urlencode( $stylesheet ) ),
 					'tax_input'    => array(