diff --git a/radix-engine-interface/src/api/object_api.rs b/radix-engine-interface/src/api/object_api.rs
index b35724aa144..391820ac98b 100644
--- a/radix-engine-interface/src/api/object_api.rs
+++ b/radix-engine-interface/src/api/object_api.rs
@@ -109,7 +109,10 @@ impl ModuleId {
 }
 
 #[repr(u8)]
-#[cfg_attr(feature = "radix_engine_fuzzing", derive(Arbitrary))]
+#[cfg_attr(
+    feature = "radix_engine_fuzzing",
+    derive(Arbitrary, serde::Serialize, serde::Deserialize)
+)]
 #[derive(
     Debug,
     Clone,
diff --git a/simulator/src/scrypto_bindgen/mod.rs b/simulator/src/scrypto_bindgen/mod.rs
index 7eb38601ab1..1744d8020f7 100644
--- a/simulator/src/scrypto_bindgen/mod.rs
+++ b/simulator/src/scrypto_bindgen/mod.rs
@@ -117,7 +117,10 @@ where
     S: SubstateDatabase,
 {
     fn lookup_schema(&self, schema_hash: &SchemaHash) -> Option<VersionedScryptoSchema> {
-        self.1.get_schema(self.0.as_node_id(), schema_hash).ok().map(|x| x.as_ref().clone())
+        self.1
+            .get_schema(self.0.as_node_id(), schema_hash)
+            .ok()
+            .map(|x| x.as_ref().clone())
     }
 
     fn resolve_type_kind(