diff --git a/codex-rs/exec/src/lib.rs b/codex-rs/exec/src/lib.rs
index 6bbf2593a0..0a25db1456 100644
--- a/codex-rs/exec/src/lib.rs
+++ b/codex-rs/exec/src/lib.rs
@@ -685,6 +685,7 @@ async fn run_exec_session(args: ExecRunArgs) -> anyhow::Result<()> {
                     params: TurnStartParams {
                         thread_id: primary_thread_id_for_span.clone(),
                         input: items.into_iter().map(Into::into).collect(),
+                        ephemeral_context: None,
                         cwd: Some(default_cwd),
                         approval_policy: Some(default_approval_policy.into()),
                         sandbox_policy: Some(default_sandbox_policy.clone().into()),