diff --git a/questions/04518-medium-fill/test-cases.ts b/questions/04518-medium-fill/test-cases.ts
index e0c7f6ea..83c9e753 100644
--- a/questions/04518-medium-fill/test-cases.ts
+++ b/questions/04518-medium-fill/test-cases.ts
@@ -10,5 +10,6 @@ type cases = [
   Expect<Equal<Fill<[1, 2, 3], true, 0, 1>, [true, 2, 3]>>,
   Expect<Equal<Fill<[1, 2, 3], true, 1, 3>, [1, true, true]>>,
   Expect<Equal<Fill<[1, 2, 3], true, 10, 0>, [1, 2, 3]>>,
+  Expect<Equal<Fill<[1, 2, 3], true, 10, 20>, [1, 2, 3]>>,
   Expect<Equal<Fill<[1, 2, 3], true, 0, 10>, [true, true, true]>>,
 ]