diff --git a/Library/Homebrew/caveats.rb b/Library/Homebrew/caveats.rb
index 485116cff1..49a517bd49 100644
--- a/Library/Homebrew/caveats.rb
+++ b/Library/Homebrew/caveats.rb
@@ -1,3 +1,5 @@
+require "forwardable"
+
 class Caveats
   extend Forwardable