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-rw-r--r--compiler/utils/FastMutInt.lhs6
1 files changed, 5 insertions, 1 deletions
diff --git a/compiler/utils/FastMutInt.lhs b/compiler/utils/FastMutInt.lhs
index 00aba34bba..e8ea58c8db 100644
--- a/compiler/utils/FastMutInt.lhs
+++ b/compiler/utils/FastMutInt.lhs
@@ -1,10 +1,14 @@
+\begin{code}
{-# OPTIONS -cpp #-}
+{-# OPTIONS_GHC -O #-}
+-- We always optimise this, otherwise performance of a non-optimised
+-- compiler is severely affected
+
--
-- (c) The University of Glasgow 2002-2006
--
-- Unboxed mutable Ints
-\begin{code}
module FastMutInt(
FastMutInt, newFastMutInt,
readFastMutInt, writeFastMutInt,