diff --git a/wp-atom.php b/wp-atom.php
index 858021025a..b8cfc6afe8 100644
--- a/wp-atom.php
+++ b/wp-atom.php
@@ -1,6 +1,6 @@
 <?php
 
-if (!isset($feed) || !$feed) {
+if (empty($feed)) {
     $blog = 1;
     $doing_rss = 1;
     require('wp-blog-header.php');
diff --git a/wp-commentsrss2.php b/wp-commentsrss2.php
index 0dc406286f..36af395de7 100644
--- a/wp-commentsrss2.php
+++ b/wp-commentsrss2.php
@@ -1,7 +1,7 @@
 <?php 
-if ( !$feed ) {
+if ( empty($feed) ) {
 	$withcomments = 1;
-    require('wp-blog-header.php');
+	require('wp-blog-header.php');
 }
 
 header('Content-type: text/xml;charset=' . get_settings('blog_charset'), true);
diff --git a/wp-rdf.php b/wp-rdf.php
index c886d8e80a..a1a2d828e1 100644
--- a/wp-rdf.php
+++ b/wp-rdf.php
@@ -1,6 +1,6 @@
 <?php /* RDF 1.0 generator, original version by garym@teledyn.com */
 
-if (!isset($feed) || !$feed) {
+if (empty($feed)) {
     $blog = 1; // enter your blog's ID
     $doing_rss = 1;
     require('wp-blog-header.php');
diff --git a/wp-rss.php b/wp-rss.php
index a970ba3f8e..ce82905f34 100644
--- a/wp-rss.php
+++ b/wp-rss.php
@@ -1,6 +1,6 @@
 <?php
 
-if (!isset($feed) || !$feed) {
+if (empty($feed)) {
     $blog = 1;
     $doing_rss = 1;
     require('wp-blog-header.php');
diff --git a/wp-rss2.php b/wp-rss2.php
index a6fcaf2376..22d6a40168 100644
--- a/wp-rss2.php
+++ b/wp-rss2.php
@@ -1,9 +1,9 @@
 <?php
 
-if (!isset($feed) || !$feed) {
-    $blog = 1;
-    $doing_rss = 1;
-    require('wp-blog-header.php');
+if (empty($feed)) {
+	$blog = 1;
+	$doing_rss = 1;
+	require('wp-blog-header.php');
 }
 
 header('Content-type: text/xml; charset=' . get_settings('blog_charset'), true);