diff --git a/lib/mutant.rb b/lib/mutant.rb
index 44922526..44c26158 100644
--- a/lib/mutant.rb
+++ b/lib/mutant.rb
@@ -1,8 +1,11 @@
 require 'immutable'
+require 'ice_nine'
 require 'abstract'
+require 'descendants_tracker'
 require 'securerandom'
 require 'to_source'
 require 'ice_nine'
+require 'ice_nine/core_ext/object'
 require 'backports'
 require 'diff/lcs'
 require 'diff/lcs/hunk'
@@ -13,10 +16,14 @@ module Mutant
 end
 
 require 'mutant/support/method_object'
+require 'mutant/support/equalizer'
 require 'mutant/helper'
 require 'mutant/random'
 require 'mutant/mutator'
 require 'mutant/mutation'
+require 'mutant/mutation/filter'
+require 'mutant/mutation/filter/code'
+require 'mutant/mutation/filter/whitelist'
 require 'mutant/mutator/registry'
 require 'mutant/mutator/literal'
 require 'mutant/mutator/literal/boolean'
@@ -41,14 +48,16 @@ require 'mutant/context'
 require 'mutant/context/scope'
 require 'mutant/subject'
 require 'mutant/matcher'
+require 'mutant/matcher/chain'
+require 'mutant/matcher/object_space'
 require 'mutant/matcher/method'
 require 'mutant/matcher/method/singleton'
 require 'mutant/matcher/method/instance'
 require 'mutant/matcher/method/classifier'
-
 require 'mutant/killer'
 require 'mutant/killer/rspec'
 require 'mutant/runner'
+require 'mutant/cli'
 require 'mutant/color'
 require 'mutant/differ'
 require 'mutant/reporter'
diff --git a/lib/mutant/cli.rb b/lib/mutant/cli.rb
index 558cc0b0..175ab4b5 100644
--- a/lib/mutant/cli.rb
+++ b/lib/mutant/cli.rb
@@ -15,7 +15,7 @@ module Mutant
         :mutation_filter => mutation_filter,
         :matcher         => matcher,
         :reporter        => Reporter::CLI.new($stderr),
-        :killer          => Killer::Rspec
+        :killer          => Killer::Rspec::Forking
       }
     end
     memoize :runner_options