diff --git a/pbs-api-types/src/datastore.rs b/pbs-api-types/src/datastore.rs
index 73c4890e..db9faa2c 100644
--- a/pbs-api-types/src/datastore.rs
+++ b/pbs-api-types/src/datastore.rs
@@ -213,7 +213,9 @@ pub enum DatastoreFSyncLevel {
 /// Datastore tuning options
 pub struct DatastoreTuning {
     /// Iterate chunks in this order
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub chunk_order: Option<ChunkOrder>,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub sync_level: Option<DatastoreFSyncLevel>,
 }