diff --git a/plugins/codex/scripts/lib/app-server.mjs b/plugins/codex/scripts/lib/app-server.mjs
index abf3d0c..e0a15eb 100644
--- a/plugins/codex/scripts/lib/app-server.mjs
+++ b/plugins/codex/scripts/lib/app-server.mjs
@@ -188,7 +188,8 @@ class SpawnedCodexAppServerClient extends AppServerClientBase {
     this.proc = spawn("codex", ["app-server"], {
       cwd: this.cwd,
       env: this.options.env,
-      stdio: ["pipe", "pipe", "pipe"]
+      stdio: ["pipe", "pipe", "pipe"],
+      shell: process.platform === "win32"
     });
 
     this.proc.stdout.setEncoding("utf8");