function bp_core_clear_root_options_cache( $option ) {
	foreach ( array( 'add_option', 'add_site_option', 'update_option', 'update_site_option' ) as $action ) {
		remove_action( $action, 'bp_core_clear_root_options_cache' );
	}

	// Surrounding code prevents infinite loops on WP < 4.4.
	$keys = array_keys( bp_get_default_options() );

	foreach ( array( 'add_option', 'add_site_option', 'update_option', 'update_site_option' ) as $action ) {
		add_action( $action, 'bp_core_clear_root_options_cache' );
	}

	$keys = array_merge( $keys, array(
		'registration',
		'avatar_default',
		'tags_blog_id',
		'sitewide_tags_blog',
		'registration',
		'fileupload_mask',
	) );

	if ( in_array( $option, $keys ) ) {
		wp_cache_delete( 'root_blog_options', 'bp' );
	}
}