function bbp_get_reply_to_dropdown( $reply_id = 0 ) {

		// Validate the reply data
		$reply_id = bbp_get_reply_id( $reply_id );
		$reply_to = bbp_get_reply_to( $reply_id );
		$topic_id = bbp_get_reply_topic_id( $reply_id );

		// Get the replies
		$posts = get_posts( array(
			'post_type'   => bbp_get_reply_post_type(),
			'post_status' => bbp_get_public_status_id(),
			'post_parent' => $topic_id,
			'numberposts' => -1,
			'orderby'     => 'menu_order',
			'order'       => 'ASC',
		) );

		// Append `reply_to` for each reply so it can be walked
		foreach ( $posts as &$post ) {

			// Check for reply post type
			$_reply_to = bbp_get_reply_to( $post->ID );

			// Make sure it's a reply to a reply
			if ( empty( $_reply_to ) || ( $topic_id === $_reply_to ) ) {
				$_reply_to = 0;
			}

			// Add reply_to to the post object so we can walk it later
			$post->reply_to = $_reply_to;
		}

		// Default "None" text
		$show_none = ( 0 === $reply_id )
			? esc_attr_x( 'None', 'Default reply to dropdown text', 'bbpress' )
			: sprintf( esc_attr__( '%1$s - %2$s', 'bbpress' ), $topic_id, bbp_get_topic_title( $topic_id ) );

		// Get the dropdown and return it
		$retval = bbp_get_dropdown( array(
			'show_none'    => $show_none,
			'select_id'    => 'bbp_reply_to',
			'select_class' => 'bbp_dropdown',
			'exclude'      => $reply_id,
			'selected'     => $reply_to,
			'post_parent'  => $topic_id,
			'post_type'    => bbp_get_reply_post_type(),
			'max_depth'    => bbp_thread_replies_depth(),
			'page'         => 1,
			'per_page'     => -1,
			'walker'       => new BBP_Walker_Reply_Dropdown(),
			'posts'        => $posts
		) );

		// Filter & return
		return apply_filters( 'bbp_get_reply_to_dropdown', $retval, $reply_id, $reply_to, $topic_id );
	}