diff --git a/compiler/src/codegen.rs b/compiler/src/codegen.rs
index 382f5ae7..793fb9e4 100644
--- a/compiler/src/codegen.rs
+++ b/compiler/src/codegen.rs
@@ -145,7 +145,7 @@ impl<'a> MethodGen<'a> {
             "}",
             |w| {
                 w.write_line(&format!(
-                    "service: Arc<Box<dyn {} + Send + Sync>>,",
+                    "service: Box<dyn {} + Send + Sync>,",
                     self.service_name
                 ));
             },
@@ -430,7 +430,7 @@ impl<'a> MethodGen<'a> {
 
 struct ServiceGen<'a> {
     proto: &'a ServiceDescriptorProto,
-    methods: Vec<MethodGen<'a>>,
+    methods: Vec<MethodGen<'a>,
     customize: &'a Customize,
     package_name: String,
 }
@@ -558,7 +558,7 @@ impl<'a> ServiceGen<'a> {
     fn write_sync_server_create(&self, w: &mut CodeWriter) {
         let method_handler_name = "::ttrpc::MethodHandler";
         let s = format!(
-            "create_{}(service: Arc<Box<dyn {} + Send + Sync>>) -> HashMap<String, Box<dyn {} + Send + Sync>>",
+            "create_{}(service: Box<dyn {} + Send + Sync>) -> HashMap<String, Box<dyn {} + Send + Sync>>",
             to_snake_case(&self.service_name()),
             self.service_name(),
             method_handler_name,
@@ -577,7 +577,7 @@ impl<'a> ServiceGen<'a> {
 
     fn write_async_server_create(&self, w: &mut CodeWriter) {
         let s = format!(
-            "create_{}(service: Arc<Box<dyn {} + Send + Sync>>) -> HashMap<String, {}>",
+            "create_{}(service: Box<dyn {} + Send + Sync>) -> HashMap<String, {}>",
             to_snake_case(&self.service_name()),
             self.service_name(),
             "::ttrpc::r#async::Service"