diff --git a/proto/milvus.proto b/proto/milvus.proto
index c5ddf25..9681967 100644
--- a/proto/milvus.proto
+++ b/proto/milvus.proto
@@ -8,7 +8,7 @@ option java_package = "io.milvus.grpc";
 option java_outer_classname = "MilvusProto";
 option java_generate_equals_and_hash = true;
 
-option csharp_namespace = "IO.Milvus.Grpc";
+option csharp_namespace = "Milvus.Client.Grpc";
 
 import "common.proto";
 import "schema.proto";