diff --git a/curriculum/schema/challenge-schema.js b/curriculum/schema/challenge-schema.js
index bf4ca425e77..dc2a1a12712 100644
--- a/curriculum/schema/challenge-schema.js
+++ b/curriculum/schema/challenge-schema.js
@@ -102,14 +102,12 @@ const quizJoi = Joi.object().keys({
         text: Joi.string().required(),
         distractors: Joi.array()
           .items(Joi.string().required())
-          .min(3)
-          .max(3)
+          .length(3)
           .required(),
         answer: Joi.string().required()
       })
     )
-    .min(20)
-    .max(20)
+    .length(20)
     .required()
 });