diff --git a/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs b/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs
index ab6f5f254..48512c03d 100644
--- a/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs
+++ b/shadowsocks-csharp/Controller/Service/Sip003Plugin.cs
@@ -94,6 +94,11 @@ public bool StartIfNeeded()
                     return false;
                 }
 
+                if (!File.Exists(_pluginProcess.StartInfo.FileName))
+                {
+                    throw new FileNotFoundException(I18N.GetString("Cannot find the plugin program file"), _pluginProcess.StartInfo.FileName);
+                }
+
                 var localPort = GetNextFreeTcpPort();
                 LocalEndPoint = new IPEndPoint(IPAddress.Loopback, localPort);