add wrapper_benchmark_messages.proto
diff --git a/csharp/generate_protos.sh b/csharp/generate_protos.sh
index 3829d05..1083d67 100755
--- a/csharp/generate_protos.sh
+++ b/csharp/generate_protos.sh
@@ -74,3 +74,8 @@
benchmarks/datasets/google_message1/proto3/*.proto \
benchmarks/benchmarks.proto \
--csharp_out=csharp/src/Google.Protobuf.Benchmarks
+
+# C# only benchmark protos
+$PROTOC -Isrc -Icsharp/src/Google.Protobuf.Benchmarks \
+ csharp/src/Google.Protobuf.Benchmarks/*.proto \
+ --csharp_out=csharp/src/Google.Protobuf.Benchmarks