So basically what I do now is wrap the code into this instead:
<?php $pistkarta = new WP_Query( array( 'page_id' => 73, 'showposts' => -1 ));
while ( $pistkarta->have_posts() ) : $pistkarta->the_post(); ?>
/* Content here from page with ID 73 */
<?php endwhile; ?>
Jeppe