Get title from parent page

Hey everyone,

I want to display the parent title above the title of the current page. I tried this:

<h3><?php echo '<a href="'.get_permalink($post->post_parent).'">'.get_the_title($post->post_parent).'</a>'; ?></h3>
<h2 class="post-title"><?php the_title(); ?></h2>

But it gives me only the title of the current page, twice.
The page is definetly a child of another page. Any idea what I’m doing wrong here?