diff --git a/Infrastructure/ERP/Util/MD5Encryption.cs b/Infrastructure/ERP/Util/MD5Encryption.cs
index 3237061b..0ab1ea7e 100644
--- a/Infrastructure/ERP/Util/MD5Encryption.cs
+++ b/Infrastructure/ERP/Util/MD5Encryption.cs
@@ -1,4 +1,5 @@
-using System.Security.Cryptography;
+using System;
+using System.Security.Cryptography;
 using System.Text;
 
 namespace U8Server.Util