diff --git a/web/skins/classic/views/state.php b/web/skins/classic/views/state.php
index 692a2290f..56227c37e 100644
--- a/web/skins/classic/views/state.php
+++ b/web/skins/classic/views/state.php
@@ -17,6 +17,7 @@
 // along with this program; if not, write to the Free Software
 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 //
+global $running;
 
 if ( !canEdit('System') ) {
   $view = 'error';