diff --git a/crates/mistral/src/mistral.rs b/crates/mistral/src/mistral.rs
index 0b76b1d665..718207ebb2 100644
--- a/crates/mistral/src/mistral.rs
+++ b/crates/mistral/src/mistral.rs
@@ -366,6 +366,7 @@ pub struct Usage {
 #[derive(Serialize, Deserialize, Debug)]
 pub struct StreamResponse {
     pub id: String,
+    #[serde(default)]
     pub object: String,
     pub created: u64,
     pub model: String,