diff --git a/codex-rs/app-server-protocol/src/protocol/thread_history.rs b/codex-rs/app-server-protocol/src/protocol/thread_history.rs
index d7482b10c3..549bf966ba 100644
--- a/codex-rs/app-server-protocol/src/protocol/thread_history.rs
+++ b/codex-rs/app-server-protocol/src/protocol/thread_history.rs
@@ -2738,6 +2738,7 @@ mod tests {
                 content: vec![codex_protocol::models::ContentItem::InputText {
                     text: "plain text".into(),
                 }],
+                metadata: None,
                 end_turn: None,
                 phase: None,
             }),