diff --git a/PicoZCache.php b/PicoZCache.php
index 71e9a7d..57d46e7 100644
--- a/PicoZCache.php
+++ b/PicoZCache.php
@@ -22,6 +22,7 @@ class PicoZCache extends AbstractPicoPlugin
 
     public function onConfigLoaded(array &$settings)
     {
+        global $config;
         if (isset($config['cache_dir'])) {
 
             // ensure cache_dir ends with '/'