diff --git a/exercises/async_loops/exercise.js b/exercises/async_loops/exercise.js
index b084927..ed963c3 100644
--- a/exercises/async_loops/exercise.js
+++ b/exercises/async_loops/exercise.js
@@ -41,6 +41,15 @@ module.exports = runner.custom(function(f) {
     clearTimeout(tooLong)
     console.log(submittedUsers)
 
+    var functionAsAString = fx.toString();
+    if (
+      functionAsAString.indexOf('for') !== -1 ||
+      functionAsAString.indexOf('while') !== -1
+    ) {
+      self.emit('fail', self.__('used_loops'));
+      return callback(null, false);
+    }
+
     if (!deepEqual(submittedUsers, users)) {
       self.emit('fail', self.__('bad_result', inspect(users), inspect(submittedUsers)))
       return callback(null, false)
diff --git a/i18n/en.json b/i18n/en.json
index 6e1f8ee..c028eea 100644
--- a/i18n/en.json
+++ b/i18n/en.json
@@ -40,7 +40,8 @@
     "Async Loops": {
       "all_loaded": "All %d users loaded!",
       "bad_result": "expected: \n%s\n but got:\n%s",
-      "took_too_long": "Took too long!"
+      "took_too_long": "Took too long!",
+      "used_loops": "Used a loop!",
     },
     "Currying": {
       "five_words": "This,problem,has,been,solved"