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diff --git a/src/Haddock/Parse.y b/src/Haddock/Parse.y
index 1aad3a18..4a0f8f99 100644
--- a/src/Haddock/Parse.y
+++ b/src/Haddock/Parse.y
@@ -1,4 +1,5 @@
{
+{-# LANGUAGE BangPatterns #-} -- required for versions of Happy before 1.18.6
{-# OPTIONS -Wwarn -w #-}
-- The above warning supression flag is a temporary kludge.
-- While working on this module you are encouraged to remove it and fix