diff --git a/rust/fastsim-core/src/vehicle.rs b/rust/fastsim-core/src/vehicle.rs
index fd65e4369..101720038 100644
--- a/rust/fastsim-core/src/vehicle.rs
+++ b/rust/fastsim-core/src/vehicle.rs
@@ -397,7 +397,7 @@ pub struct RustVehicle {
     pub fc_kw_out_array: Vec<f64>,
     #[doc(hidden)]
     #[doc_field(skip_doc)]
-    #[serde(default)]
+    #[serde(default, skip_serializing)]
     #[serde(alias = "fcEffArray")]
     pub fc_eff_array: Vec<f64>,
     #[doc(hidden)]
@@ -426,7 +426,7 @@ pub struct RustVehicle {
     pub mc_full_eff_array: Vec<f64>,
     #[doc(hidden)]
     #[doc_field(skip_doc)]
-    #[serde(alias = "vehKg")]
+    #[serde(skip)]
     pub veh_kg: f64,
     #[doc(hidden)]
     #[doc_field(skip_doc)]