diff --git a/wp-includes/vars.php b/wp-includes/vars.php
index d28d99b972..3b824a959a 100644
--- a/wp-includes/vars.php
+++ b/wp-includes/vars.php
@@ -12,6 +12,10 @@
  * @package WordPress
  */
 
+global $pagenow,
+	$is_lynx, $is_gecko, $is_winIE, $is_macIE, $is_opera, $is_NS4, $is_safari, $is_chrome, $is_iphone, $is_IE,
+	$is_apache, $is_IIS, $is_iis7;
+
 // On which page are we ?
 if ( is_admin() ) {
 	// wp-admin pages are checked more carefully