diff --git a/apps/pr-reviewer/fixtures/demo-pr/order-id.ts b/apps/pr-reviewer/fixtures/demo-pr/order-id.ts
index f7b0818..c9b3d6a 100644
--- a/apps/pr-reviewer/fixtures/demo-pr/order-id.ts
+++ b/apps/pr-reviewer/fixtures/demo-pr/order-id.ts
@@ -1,3 +1,4 @@
 export function nextOrderId(last: string): string {
-  return String(parseInt(last) + 1);
+  const next = parseInt(last, 10) + 1;
+  return String(next).padStart(last.length, "0");
 }