diff --git a/codex-rs/tui/src/app_server_session/rollout_history_tests.rs b/codex-rs/tui/src/app_server_session/rollout_history_tests.rs
index e3b5333412..0250b747c7 100644
--- a/codex-rs/tui/src/app_server_session/rollout_history_tests.rs
+++ b/codex-rs/tui/src/app_server_session/rollout_history_tests.rs
@@ -319,13 +319,13 @@ async fn cached_legacy_resume_revalidates_history_across_migration_settings() ->
         let local_settings = crate::local_settings::LocalSettings::from(&resume_config);
         let next_request_id = app_server.next_request_id;
         let legacy = {
-            let resume = app_server.resume_thread(
+            // Keep the large resume future off the Windows test thread's stack.
+            let mut resume = Box::pin(app_server.resume_thread(
                 &local_settings,
                 resume_config.clone(),
                 legacy_thread_id,
                 ResumeModelSettings::RestoreFromThread,
-            );
-            tokio::pin!(resume);
+            ));
             drop(maintenance_guard);
             // This current-thread test polls resume before yielding to the startup worker.
             // Resume must acquire its guard before waiting for metadata revalidation.