diff --git a/libraries/Header.class.php b/libraries/Header.class.php
index 02f69a981fc1..c7fc7c34fa9b 100644
--- a/libraries/Header.class.php
+++ b/libraries/Header.class.php
@@ -13,12 +13,6 @@
 require_once 'libraries/RecentTable.class.php';
 require_once 'libraries/Menu.class.php';
 
-
-// FIXME: this global got lost :(
-// here, the function does not exist with this configuration:
-// $cfg['ServerDefault'] = 0;
-$is_superuser = function_exists('PMA_isSuperuser') && PMA_isSuperuser();
-
 /**
  * Class used to output the HTTP and HTML headers
  *
diff --git a/libraries/common.inc.php b/libraries/common.inc.php
index d4593423b276..e0eb6e786cd6 100644
--- a/libraries/common.inc.php
+++ b/libraries/common.inc.php
@@ -1085,6 +1085,10 @@
 }
 unset($dummy);
 
+// here, the function does not exist with this configuration:
+// $cfg['ServerDefault'] = 0;
+$GLOBALS['is_superuser'] = function_exists('PMA_isSuperuser') && PMA_isSuperuser();
+
 if (!empty($__redirect) && in_array($__redirect, $goto_whitelist)) {
     /**
      * include subform target page