regenerate C# protos
diff --git a/csharp/src/Google.Protobuf.Test.TestProtos/Unittest.cs b/csharp/src/Google.Protobuf.Test.TestProtos/Unittest.cs
index 706b7c4..c1f43ce 100644
--- a/csharp/src/Google.Protobuf.Test.TestProtos/Unittest.cs
+++ b/csharp/src/Google.Protobuf.Test.TestProtos/Unittest.cs
@@ -2,7 +2,7 @@
// Generated by the protocol buffer compiler. DO NOT EDIT!
// source: unittest.proto
// </auto-generated>
-#pragma warning disable 1591, 0612, 3021
+#pragma warning disable 1591, 0612, 3021, 8981
#region Designer generated code
using pb = global::Google.Protobuf;