diff --git a/src/Data/Language/Ruby/AST.hs b/src/Data/Language/Ruby/AST.hs
index cf896c2..121b6d3 100644
--- a/src/Data/Language/Ruby/AST.hs
+++ b/src/Data/Language/Ruby/AST.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE DuplicateRecordFields, OverloadedLists #-}
+{-# LANGUAGE DuplicateRecordFields, OverloadedLists, StrictData #-}
 {-# OPTIONS_GHC -Wall #-}
 module Data.Language.Ruby.AST
   ( Begin(..)