diff --git a/lib/mutant/mutator/node/nthref.rb b/lib/mutant/mutator/node/nthref.rb
index a2bd0920..25aaec46 100644
--- a/lib/mutant/mutator/node/nthref.rb
+++ b/lib/mutant/mutator/node/nthref.rb
@@ -1,3 +1,5 @@
+# encoding: utf-8
+
 module Mutant
   class Mutator
     class Node
diff --git a/lib/mutant/version.rb b/lib/mutant/version.rb
index fabf31c9..15e4ad65 100644
--- a/lib/mutant/version.rb
+++ b/lib/mutant/version.rb
@@ -1,3 +1,5 @@
+# encoding: utf-8
+
 module Mutant
   # The current mutant version
   VERSION = '0.3.0.beta22'.freeze