diff --git a/src/macros/src/main.rs b/src/macros/src/main.rs
index ebc1086..f2b884d 100644
--- a/src/macros/src/main.rs
+++ b/src/macros/src/main.rs
@@ -5,16 +5,21 @@ extern crate byteorder;
 
 use std::net::{TcpListener, TcpStream};
 
+#[derive(Debug, RustcEncodable, RustcDecodable)]
+pub struct Foo {
+    message: String
+}
+
 rpc_service!(my_server:
-    hello(String) -> String;
+    hello(::Foo) -> ::Foo;
     add((i32, i32)) -> i32;
 );
 
 use my_server::*;
 
 impl Service for () {
-    fn hello(&self, s: String) -> String {
-        format!("Hello, {}", s)
+    fn hello(&self, s: Foo) -> Foo {
+        Foo{message: format!("Hello, {}", &s.message)}
     }
     
     fn add(&self, (x, y): (i32, i32)) -> i32 {
@@ -33,5 +38,5 @@ fn main() {
     let mut client = Client(TcpStream::connect("127.0.0.1:9000").unwrap());
     println!("Client running");
     println!("add((1, 2)) => {}", client.add((1, 2)).unwrap());
-    println!("hello(\"adam\") => {:?}", client.hello("Adam".into()));
+    println!("hello(\"adam\") => {:?}", client.hello(Foo{message: "Adam".into()}));
 }