diff --git a/lib/libpk/build.rs b/lib/libpk/build.rs
index 46c0af3e..6569962b 100644
--- a/lib/libpk/build.rs
+++ b/lib/libpk/build.rs
@@ -3,6 +3,7 @@ use std::io::Result;
 fn main() -> Result<()> {
     prost_build::Config::new()
         .type_attribute(".ShardState", "#[derive(serde::Serialize)]")
+        .field_attribute(".ShardState.shard_id", "#[serde(rename = \"id\")]")
         .compile_protos(&["../../proto/state.proto"], &["../../proto/"])?;
     Ok(())
 }