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-rw-r--r--libraries/base/GHC/IO/Encoding/CodePage.hs2
1 files changed, 1 insertions, 1 deletions
diff --git a/libraries/base/GHC/IO/Encoding/CodePage.hs b/libraries/base/GHC/IO/Encoding/CodePage.hs
index 2532e071e6..6c77e65c41 100644
--- a/libraries/base/GHC/IO/Encoding/CodePage.hs
+++ b/libraries/base/GHC/IO/Encoding/CodePage.hs
@@ -174,7 +174,7 @@ indexInt (ConvArray p) (I# i) = I# (indexInt16OffAddr# p i)
{-# INLINE indexWord8 #-}
indexWord8 :: ConvArray Word8 -> Int -> Word8
-indexWord8 (ConvArray p) (I# i) = W8# (indexWord8OffAddr# p i)
+indexWord8 (ConvArray p) (I# i) = W8# (narrowWord8# (indexWord8OffAddr# p i))
{-# INLINE indexChar #-}
indexChar :: ConvArray Char -> Int -> Char