diff --git a/src/OssStorageServiceProvider.php b/src/OssStorageServiceProvider.php
index 301b684..17ce0a3 100644
--- a/src/OssStorageServiceProvider.php
+++ b/src/OssStorageServiceProvider.php
@@ -13,6 +13,7 @@
 
 use Iidestiny\Flysystem\Oss\OssAdapter;
 use Iidestiny\Flysystem\Oss\Plugins\FileUrl;
+use Iidestiny\Flysystem\Oss\Plugins\SignUrl;
 use Illuminate\Support\ServiceProvider;
 use Illuminate\Support\Facades\Storage;
 use League\Flysystem\Filesystem;
@@ -40,6 +41,7 @@ public function boot()
             $filesystem = new Filesystem($adapter);
 
             $filesystem->addPlugin(new FileUrl());
+            $filesystem->addPlugin(new SignUrl());
 
             return $filesystem;
         });