diff --git a/src/wp-includes/script-loader.php b/src/wp-includes/script-loader.php
index 76155ac226..d104598d3f 100644
--- a/src/wp-includes/script-loader.php
+++ b/src/wp-includes/script-loader.php
@@ -3718,6 +3718,7 @@ function wp_enqueue_classic_theme_styles() {
 	if ( ! wp_theme_has_theme_json() ) {
 		$suffix = wp_scripts_get_suffix();
 		wp_register_style( 'classic-theme-styles', '/' . WPINC . "/css/classic-themes$suffix.css" );
+		wp_style_add_data( 'classic-theme-styles', 'path', ABSPATH . WPINC . "/css/classic-themes$suffix.css" );
 		wp_enqueue_style( 'classic-theme-styles' );
 	}
 }