function bbp_get_reply_to( $reply_id = 0 ) {

		// Assume there is no reply_to set
		$reply_to = 0;

		// Check that reply_id is valid
		$reply_id = bbp_get_reply_id( $reply_id );

		// Get reply_to value
		if ( ! empty( $reply_id ) ) {
			$reply_to = (int) get_post_meta( $reply_id, '_bbp_reply_to', true );
		}

		// Filter & return
		return (int) apply_filters( 'bbp_get_reply_to', $reply_to, $reply_id );
	}