diff --git a/single.php b/single.php
index a8dca48..dc4997f 100644
--- a/single.php
+++ b/single.php
@@ -97,7 +97,7 @@
 								if(get_field('urlaub',$tb->ID)->ID === get_the_ID()){
 									$thumb = wp_get_attachment_image_src( get_post_thumbnail_id($tb->ID), 'post-thumb' );
 									echo('<a href="'.get_the_permalink($tb->ID).'" id="post-'.$tb->ID.'" ');
-									post_class('post');
+									post_class('post', $tb->ID);
 									echo(' style="background-image: url('.$thumb['0'].');"><div class="post-overlay">');
 									echo('<div class="archive-post-header"><p class="archive-post-date">'.get_the_time(get_option('date_format')).'</p>');
 									echo('<h2 class="archive-post-title">'.get_the_title($tb->ID).'</h2></div></div></a>');