diff --git a/seed/challenges/object-oriented-and-functional-programming.json b/seed/challenges/object-oriented-and-functional-programming.json
index b599d6cd13..c49dd082d8 100644
--- a/seed/challenges/object-oriented-and-functional-programming.json
+++ b/seed/challenges/object-oriented-and-functional-programming.json
@@ -62,7 +62,7 @@
         "assert(typeof((new MotorBike()).seats) === 'number', '<code>seats</code> should be have a <code>engines</code> attribute set to a number.');"
       ],
       "challengeSeed":[
-        "// Let's add the properties engine and seats to the car in the same way that the property wheels has been added below. They should both be numbers.",
+        "// Let's add the properties engines and seats to the car in the same way that the property wheels has been added below. They should both be numbers.",
         "var Car = function() {",
         "  this.wheels = 4;",
         "  this.engines = 1;",