diff --git a/codex-rs/core/src/realtime_context_tests.rs b/codex-rs/core/src/realtime_context_tests.rs
index 709bf31765..c82fdfed38 100644
--- a/codex-rs/core/src/realtime_context_tests.rs
+++ b/codex-rs/core/src/realtime_context_tests.rs
@@ -13,6 +13,7 @@ use tempfile::TempDir;
 fn thread_metadata(cwd: &str, title: &str, first_user_message: &str) -> ThreadMetadata {
     ThreadMetadata {
         id: ThreadId::new(),
+        forked_from_id: None,
         rollout_path: PathBuf::from("/tmp/rollout.jsonl"),
         created_at: Utc
             .timestamp_opt(1_709_251_100, 0)