diff --git a/server/core/Plugin_Api.php b/server/core/Plugin_Api.php
index 28e1407..89f82fb 100644
--- a/server/core/Plugin_Api.php
+++ b/server/core/Plugin_Api.php
@@ -1,8 +1,8 @@
 <?php
 
 //Init plugin directory
-if (!defined('RCUBE_PLUGINS_DIR')) {
-    define('RCUBE_PLUGINS_DIR', RCUBE_INSTALL_PATH . 'plugins/');
+if (!defined('PLUGINS_DIR')) {
+    define('PLUGINS_DIR', RCUBE_INSTALL_PATH . 'plugins/');
 }
 
 class plugin_api{