diff --git a/volo-build/src/grpc_backend.rs b/volo-build/src/grpc_backend.rs
index 9bfbeba1..23eb9a3f 100644
--- a/volo-build/src/grpc_backend.rs
+++ b/volo-build/src/grpc_backend.rs
@@ -1,6 +1,5 @@
 use crate::util::{get_base_dir, write_file, write_item};
 use itertools::Itertools;
-use pilota_build::middle::context::Mode;
 use pilota_build::{
     db::RirDatabase,
     rir,
@@ -8,8 +7,6 @@ use pilota_build::{
     tags::protobuf::{ClientStreaming, ServerStreaming},
     CodegenBackend, Context, DefId, IdentName, Symbol,
 };
-use std::io::Write;
-use std::path::Path;
 use volo::FastStr;
 
 pub struct MkGrpcBackend;
diff --git a/volo-build/src/thrift_backend.rs b/volo-build/src/thrift_backend.rs
index db87b015..e85dc4ad 100644
--- a/volo-build/src/thrift_backend.rs
+++ b/volo-build/src/thrift_backend.rs
@@ -1,11 +1,10 @@
-use std::{io::Write, path::Path};
+use std::path::Path;
 
 use crate::util::{get_base_dir, write_file, write_item};
 use itertools::Itertools;
 use pilota_build::{
     codegen::thrift::DecodeHelper,
     db::RirDatabase,
-    middle::context::Mode,
     rir::{self, Method},
     tags::RustWrapperArc,
     CodegenBackend, Context, DefId, IdentName, Symbol, ThriftBackend,