diff --git a/src/gateway/gateway-codex-harness.live.test.ts b/src/gateway/gateway-codex-harness.live.test.ts
index 9d4490b67b1..36167d716e9 100644
--- a/src/gateway/gateway-codex-harness.live.test.ts
+++ b/src/gateway/gateway-codex-harness.live.test.ts
@@ -211,6 +211,7 @@ async function writeLiveGatewayConfig(params: {
         model: { primary: params.modelKey },
         sandbox: { mode: "off" },
       },
+      list: [{ id: "dev", default: true }],
     },
   };
   await fs.writeFile(params.configPath, `${JSON.stringify(cfg, null, 2)}\n`);