diff --git a/ghost/admin/mirage/factories/offer.js b/ghost/admin/mirage/factories/offer.js
index 904a8cdbbe..5f14e66ef4 100644
--- a/ghost/admin/mirage/factories/offer.js
+++ b/ghost/admin/mirage/factories/offer.js
@@ -11,5 +11,10 @@ export default Factory.extend({
     amount() { return faker.datatype.number({min: 1, max: 10}); },
     displayTitle() { return faker.lorem.word(); },
     code() { return faker.lorem.slug(); },
-    createdAt() { return randomDate(); }
+    createdAt() { return randomDate(); },
+    tier() {
+        return {
+            id: '1'
+        };
+    }
 });