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-rw-r--r--utils/hpc/HpcParser.y1
1 files changed, 1 insertions, 0 deletions
diff --git a/utils/hpc/HpcParser.y b/utils/hpc/HpcParser.y
index b4d8c79518..01307bf565 100644
--- a/utils/hpc/HpcParser.y
+++ b/utils/hpc/HpcParser.y
@@ -1,4 +1,5 @@
{
+{-# LANGUAGE BangPatterns #-} -- required for versions of Happy before 1.18.6
{-# OPTIONS -Wwarn -XNoMonomorphismRestriction #-}
-- The NoMonomorphismRestriction deals with a Happy infelicity
-- With OutsideIn's more conservativ monomorphism restriction