diff --git a/exercises/binary/binary_test.rb b/exercises/binary/binary_test.rb
index 310c12c326..67c92628c8 100755
--- a/exercises/binary/binary_test.rb
+++ b/exercises/binary/binary_test.rb
@@ -49,7 +49,7 @@ def test_binary_ignores_leading_zeros
 
   def test_invalid_binary_numbers_raise_an_error
     skip
-    %w(012 10nope nope10 001\ nope).each do |input|
+    %w(012 10nope nope10 10nope10 001\ nope 2).each do |input|
       assert_raises ArgumentError do
         Binary.new(input)
       end