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-rw-r--r--compiler/utils/FastMutInt.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/compiler/utils/FastMutInt.hs b/compiler/utils/FastMutInt.hs
index 6ba139a486..20206f8b1e 100644
--- a/compiler/utils/FastMutInt.hs
+++ b/compiler/utils/FastMutInt.hs
@@ -1,5 +1,5 @@
{-# LANGUAGE BangPatterns, MagicHash, UnboxedTuples #-}
-{-# OPTIONS_GHC -O #-}
+{-# OPTIONS_GHC -O2 #-}
-- We always optimise this, otherwise performance of a non-optimised
-- compiler is severely affected
--