diff --git a/src/lib.rs b/src/lib.rs
index 0ad745a..4453414 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -6,6 +6,7 @@ use serde::{Serialize, Deserialize};
 pub struct Delta {
     pub role: String,
     pub id: String,
+    #[serde(rename(serialize = "parentMessageId", deserialize = "parentMessageId"))]
     pub parent_message_id: String,
     pub text: String,
     pub delta: String,