diff --git a/netcrypt/netcrypt/Packer.cs b/netcrypt/netcrypt/Packer.cs
index 95fa935..9c25274 100644
--- a/netcrypt/netcrypt/Packer.cs
+++ b/netcrypt/netcrypt/Packer.cs
@@ -96,7 +96,7 @@ public static byte[] Pack(byte[] assembly, DotNetVersion version)
                     break;
                 case DotNetVersion.v2_0:
                 default:
-                    providerOptions.Add("CompilerVersion", "v4.0");
+                    providerOptions.Add("CompilerVersion", "v2.0");
                     break;
             }