diff --git a/shadowsocks-csharp/Controller/ShadowsocksController.cs b/shadowsocks-csharp/Controller/ShadowsocksController.cs
index 0056e20b..c94cbe39 100644
--- a/shadowsocks-csharp/Controller/ShadowsocksController.cs
+++ b/shadowsocks-csharp/Controller/ShadowsocksController.cs
@@ -482,7 +482,6 @@ namespace Shadowsocks.Controller
                 _pacServer = new PACServer(_pacDaemon);
             }
 
-            _pacServer.UpdatePACURL(_config);
             if (gfwListUpdater == null)
             {
                 gfwListUpdater = new GFWListUpdater();
diff --git a/shadowsocks-csharp/Controller/System/SystemProxy.cs b/shadowsocks-csharp/Controller/System/SystemProxy.cs
index f02d3d11..e11342ab 100644
--- a/shadowsocks-csharp/Controller/System/SystemProxy.cs
+++ b/shadowsocks-csharp/Controller/System/SystemProxy.cs
@@ -39,6 +39,7 @@ namespace Shadowsocks.Controller
                         }
                         else
                         {
+                            pacSrv.UpdatePACURL(config);
                             pacUrl = pacSrv.PacUrl;
                         }
                         Sysproxy.SetIEProxy(true, false, null, pacUrl);