diff --git a/lib/simplecov/result.rb b/lib/simplecov/result.rb
index 1d5e2292..6965c427 100644
--- a/lib/simplecov/result.rb
+++ b/lib/simplecov/result.rb
@@ -1,4 +1,5 @@
 require 'digest/sha1'
+require 'forwardable'
 
 module SimpleCov
   #