diff --git a/src/MessagePack.MSBuild.Tasks/MessagePackGenerator.cs b/src/MessagePack.MSBuild.Tasks/MessagePackGenerator.cs
index 0e9f3e727..69d8f23e5 100644
--- a/src/MessagePack.MSBuild.Tasks/MessagePackGenerator.cs
+++ b/src/MessagePack.MSBuild.Tasks/MessagePackGenerator.cs
@@ -20,8 +20,6 @@ namespace MessagePack.MSBuild.Tasks
 {
     public class MessagePackGenerator : Microsoft.Build.Utilities.Task, ICancelableTask
     {
-        private const string GeneratedFileName = "mpc_generated.cs";
-
         private readonly CancellationTokenSource cts = new CancellationTokenSource();
 
         [Required]