diff --git a/csharp/src/Google.Protobuf.Test.TestProtos/UnittestProto3Optional.pb.cs b/csharp/src/Google.Protobuf.Test.TestProtos/UnittestProto3Optional.pb.cs
index 4502ffaa12..b97d56f8d5 100644
--- a/csharp/src/Google.Protobuf.Test.TestProtos/UnittestProto3Optional.pb.cs
+++ b/csharp/src/Google.Protobuf.Test.TestProtos/UnittestProto3Optional.pb.cs
@@ -65,8 +65,9 @@ namespace ProtobufUnittest {
             "bzNPcHRpb25hbEV4dGVuc2lvbnMyPAoPZXh0X25vX29wdGlvbmFsEh8uZ29v",
             "Z2xlLnByb3RvYnVmLk1lc3NhZ2VPcHRpb25zGIjN2akBIAEoBTJBChFleHRf",
             "d2l0aF9vcHRpb25hbBIfLmdvb2dsZS5wcm90b2J1Zi5NZXNzYWdlT3B0aW9u",
-            "cxiJzdmpASABKAWIAQE6DMDozM0KCMjozM0KEEIlCiFjb20uZ29vZ2xlLnBy",
-            "b3RvYnVmLnRlc3RpbmcucHJvdG9QAWIGcHJvdG8z"));
+            "cxiJzdmpASABKAWIAQE6DMDozM0KCMjozM0KEEI4CiFjb20uZ29vZ2xlLnBy",
+            "b3RvYnVmLnRlc3RpbmcucHJvdG9QAaoCEFByb3RvYnVmVW5pdHRlc3RiBnBy",
+            "b3RvMw=="));
       descriptor = pbr::FileDescriptor.FromGeneratedCode(descriptorData,
           new pbr::FileDescriptor[] { global::Google.Protobuf.Reflection.DescriptorReflection.Descriptor, },
           new pbr::GeneratedClrTypeInfo(null, null, new pbr::GeneratedClrTypeInfo[] {
diff --git a/csharp/src/Google.Protobuf.Test/testprotos.pb b/csharp/src/Google.Protobuf.Test/testprotos.pb
index f5a07d72ff..5e361f9027 100644
Binary files a/csharp/src/Google.Protobuf.Test/testprotos.pb and b/csharp/src/Google.Protobuf.Test/testprotos.pb differ