diff --git a/lib/koans/20_comprehensions.ex b/lib/koans/20_comprehensions.ex
index 35eeccb3..67acd18c 100644
--- a/lib/koans/20_comprehensions.ex
+++ b/lib/koans/20_comprehensions.ex
@@ -23,11 +23,4 @@ defmodule Comprehensions do
   koan "Use a filter to reduce your work" do
     assert (for n <- [1, 2, 3, 4, 5, 6], n > 3, do: n) == ___
   end
-
-  koan "Add the result of a comprehension to an existing collection" do
-    collection = ["Apple Pie"]
-    collection = for x <- ["Pecan", "Pumpkin"], into: collection, do: "#{x} Pie"
-    assert collection == ___
-  end
-
 end
diff --git a/test/koans/comprehensions_koans_test.exs b/test/koans/comprehensions_koans_test.exs
index bcf74982..53d2c257 100644
--- a/test/koans/comprehensions_koans_test.exs
+++ b/test/koans/comprehensions_koans_test.exs
@@ -9,7 +9,6 @@ defmodule ComprehensionsTests do
       ["Hello World", "Apple Pie"],
       ["little dogs", "little cats", "big dogs", "big cats"],
       [4, 5, 6],
-      ["Apple Pie", "Pecan Pie", "Pumpkin Pie"],
     ]
 
     test_all(Comprehensions, answers)
diff --git a/test/test_helper.exs b/test/test_helper.exs
index 56d98f43..3e92a2de 100644
--- a/test/test_helper.exs
+++ b/test/test_helper.exs
@@ -15,8 +15,8 @@ defmodule TestHarness do
     koans_count = length(koans)
     answer_count = length(answers)
 
-    if length(koans) > length(answers) do
-      raise "Answer missing for #{module}. #{koans_count} koans, but only #{answer_count} answers."
+    if length(koans) != length(answers) do
+      raise "Mismatched number of answers for module #{module}. #{koans_count} koans, but #{answer_count} answers."
     else
       koans
     end