diff --git a/_upgrade.php b/_upgrade.php
index ee83932..c040121 100755
--- a/_upgrade.php
+++ b/_upgrade.php
@@ -12,9 +12,13 @@
 use FeatherBB\Core\AdminUtils;
 
 // Make sure no one attempts to run this script "directly"
-if (isset($feather)) {
+if (isset($upgrade_script)) {
+    echo "plugin upgrade script";
     // Check if 'style' folder from version <= 0.2.2 exists
     if (is_dir(__DIR__.'/style')) {
         AdminUtils::delete_folder(__DIR__.'/style');
     }
 }
+else {
+    echo "no feather";
+}