diff --git a/core/modules/system/system.install b/core/modules/system/system.install
index 7777e0c..a21ac9a 100644
--- a/core/modules/system/system.install
+++ b/core/modules/system/system.install
@@ -15,7 +15,6 @@
  * Implements hook_requirements().
  */
 function system_requirements($phase) {
-  global $base_url;
   $requirements = array();
 
   // Report Drupal version