diff --git a/seed_data/challenges/basic-bonfires.json b/seed_data/challenges/basic-bonfires.json
index 7524602729..5ea57ba986 100644
--- a/seed_data/challenges/basic-bonfires.json
+++ b/seed_data/challenges/basic-bonfires.json
@@ -369,7 +369,8 @@
         "expect(mutation(['zyxwvutsrqponmlkjihgfedcba', 'qrstu'])).to.be.true;",
         "expect(mutation(['Mary', 'Army'])).to.be.true;",
         "expect(mutation(['Mary', 'Aarmy'])).to.be.false;",
-        "expect(mutation(['Alien', 'line'])).to.be.true;"
+        "expect(mutation(['Alien', 'line'])).to.be.true;",
+        "expect(mutation(['floor', 'for'])).to.be.true;"
       ],
       "MDNlinks": ["Array.sort()"],
       "challengeType": 5