diff --git a/lib/mutant/reporter/cli.rb b/lib/mutant/reporter/cli.rb
index 934a566a..8749a55c 100644
--- a/lib/mutant/reporter/cli.rb
+++ b/lib/mutant/reporter/cli.rb
@@ -243,7 +243,7 @@ module Mutant
       #
       def colorized_diff(mutation)
         if mutation.kind_of?(Mutation::Noop)
-          io.mutation.original_source
+          puts mutation.original_source
           return
         end