diff --git a/src/rpc/res.rs b/src/rpc/res.rs
index 3befa1cc..73a39942 100644
--- a/src/rpc/res.rs
+++ b/src/rpc/res.rs
@@ -14,6 +14,7 @@ pub enum Output {
 
 #[derive(Serialize)]
 pub struct Response<T> {
+	#[serde(skip_serializing_if = "Option::is_none")]
 	id: Option<Value>,
 	#[serde(flatten)]
 	content: Content<T>,