diff --git a/src/dls.rs b/src/dls.rs
index 3f4c304..01b679f 100644
--- a/src/dls.rs
+++ b/src/dls.rs
@@ -171,11 +171,13 @@ pub struct ClusterConfig {
 #[serde(rename_all = "PascalCase")]
 pub struct HostConfig {
     pub name: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub cluster_name: Option<String>,
 
     pub annotations: Map<String, String>,
     pub bootstrap_config: String,
-    #[serde(rename = "IPXE")]
+    pub config: String,
+    #[serde(rename = "IPXE", skip_serializing_if = "Option::is_none")]
     pub ipxe: Option<String>,
     #[serde(rename = "IPs")]
     pub ips: Vec<IpAddr>,