diff --git a/crmeb/app/AppService.php b/crmeb/app/AppService.php
index 436a9d4bc..45118a3e5 100644
--- a/crmeb/app/AppService.php
+++ b/crmeb/app/AppService.php
@@ -26,6 +26,6 @@ class AppService extends Service
 
     public function boot()
     {
-
+        defined('DS') || define('DS', DIRECTORY_SEPARATOR);
     }
 }