function bbp_admin_setting_callback_topics_per_page() {
?>

	<input name="_bbp_topics_per_page" id="_bbp_topics_per_page" type="number" min="1" step="1" value="<?php bbp_form_option( '_bbp_topics_per_page', '15' ); ?>" class="small-text"<?php bbp_maybe_admin_setting_disabled( '_bbp_topics_per_page' ); ?> />
	<?php esc_html_e( 'per page', 'bbpress' ); ?>

<?php
}