diff --git a/challenges/02-javascript-algorithms-and-data-structures/object-oriented-programming.json b/challenges/02-javascript-algorithms-and-data-structures/object-oriented-programming.json
index c091f47dd7..62cb545880 100644
--- a/challenges/02-javascript-algorithms-and-data-structures/object-oriented-programming.json
+++ b/challenges/02-javascript-algorithms-and-data-structures/object-oriented-programming.json
@@ -660,8 +660,8 @@
         "",
         "// Add your code below this line",
         "",
-        "let duck",
-        "let beagle",
+        "let duck; // Change this line",
+        "let beagle; // Change this line",
         "",
         "duck.eat(); // Should print \"nom nom nom\"",
         "beagle.eat(); // Should print \"nom nom nom\" "
@@ -992,4 +992,4 @@
       "translations": {}
     }
   ]
-}
\ No newline at end of file
+}