Issue With query_posts()?

I’m trying to display all the posts from a particular category.

This is the current code:

query_posts( 'cat=news' );

 if (have_posts()) : while (have_posts()) : the_post(); ?>
  <a href="<?php the_permalink() ?>" style="font-size: 20px;"><?php the_title(); ?></a>
    <?php the_excerpt() ?>

<?php endwhile; endif; ?>

news is the category slug. When using this code it’s returning every post, not the posts in that particular category. Anyone know what I’m doing wrong?