diff --git a/src/hass.rs b/src/hass.rs
index 368d56c..1b56d70 100644
--- a/src/hass.rs
+++ b/src/hass.rs
@@ -34,6 +34,7 @@ pub struct HassConfig {
     pub unique_id: String,
     pub object_id: String,
     pub icon: String,
+    #[serde(skip_serializing_if = "Option::is_none")]
     pub retain: Option<bool>,
 }