diff --git a/Library/Homebrew/compat/language/haskell.rb b/Library/Homebrew/compat/language/haskell.rb
index 8d1b3772e9..cef97d8187 100644
--- a/Library/Homebrew/compat/language/haskell.rb
+++ b/Library/Homebrew/compat/language/haskell.rb
@@ -2,7 +2,7 @@ module Language
   module Haskell
     module Cabal
       def cabal_clean_lib
-        # avoid installing any Haskell libraries, as a matter of policy
+        odeprecated "Language::Haskell::Cabal#cabal_clean_lib"
         rm_rf lib
       end
     end