diff --git a/extensions/codex/src/app-server/run-attempt.test.ts b/extensions/codex/src/app-server/run-attempt.test.ts
index e8c5c1c1cd8..6df9e8527fb 100644
--- a/extensions/codex/src/app-server/run-attempt.test.ts
+++ b/extensions/codex/src/app-server/run-attempt.test.ts
@@ -452,8 +452,8 @@ describe("runCodexAppServerAttempt", () => {
       params,
       resolvedWorkspace: workspaceDir,
       effectiveWorkspace: workspaceDir,
-      sandboxSessionKey: params.sessionKey,
-      sandbox: undefined,
+      sandboxSessionKey: "agent:main:session-1",
+      sandbox: null,
       runAbortController: new AbortController(),
       sessionAgentId: "main",
       pluginConfig: {},