diff --git a/modules/comment/comment.module b/modules/comment/comment.module
index db3d04105a155a76bd099299a9f43e4c0eeb8e13..1676d0e086d90db075dc87365787955a33421e85 100644
--- a/modules/comment/comment.module
+++ b/modules/comment/comment.module
@@ -1749,7 +1749,7 @@ function _comment_per_page() {
 function _comment_get_display_setting($setting) {
   global $user;
 
-  if ($_GET[$setting]) {
+  if (isset($_GET[$setting])) {
     $value = $_GET[$setting];
   }
   else {