diff --git a/wp-includes/post-template.php b/wp-includes/post-template.php
index 67891283f2..00613118a9 100644
--- a/wp-includes/post-template.php
+++ b/wp-includes/post-template.php
@@ -322,7 +322,8 @@ function get_post_class( $class = '', $post_id = null ) {
 		return $classes;
 
 	$classes[] = 'post-' . $post->ID;
-	$classes[] = $post->post_type;
+	if ( ! is_admin() )
+		$classes[] = $post->post_type;
 	$classes[] = 'type-' . $post->post_type;
 	$classes[] = 'status-' . $post->post_status;