Index: modules/comment/comment.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/comment/comment.module,v
retrieving revision 1.721
diff -u -r1.721 comment.module
--- modules/comment/comment.module	8 Jun 2009 05:12:15 -0000	1.721
+++ modules/comment/comment.module	8 Jun 2009 20:09:17 -0000
@@ -1166,8 +1166,8 @@
         ->limit($comments_per_page);
 
       $count_query = db_select('comment', 'c');
+      $count_query->addExpression('COUNT(*)');
       $count_query
-        ->fields('c', array('cid'))
         ->condition('c.nid', $nid)
         ->addTag('node_access');