1 files changed, 10 insertions, 0 deletions

diff --git a/src/Data/ByteString/Base32/Internal.hs b/src/Data/ByteString/Base32/Internal.hs
index aa7c5b3..31f6e30 100644
--- a/src/Data/ByteString/Base32/Internal.hs
+++ b/src/Data/ByteString/Base32/Internal.hs
@@ -26,7 +26,9 @@ module Data.ByteString.Base32.Internal
 import Prelude hiding (catch)
 #endif
 import Control.Exception hiding (mask)
+#ifdef VERSION_bits_extras
 import Data.Bits.Extras
+#endif
 import Data.ByteString as BS
 import Data.ByteString.Internal as BS
 import Data.Word
@@ -46,11 +48,19 @@ type Word5 = Word8
 -- intrinsics
 --
 toBE64' :: Word64 -> Word64
+#ifdef VERSION_bits_extras
 toBE64' = if getSystemEndianness == BigEndian then id else byteSwap
+#else
+toBE64' = toBE64
+#endif
 {-# INLINE toBE64' #-}
 
 toBE32' :: Word32 -> Word32
+#ifdef VERSION_bits_extras
 toBE32' = if getSystemEndianness == BigEndian then id else byteSwap
+#else
+toBE32' = toBE32
+#endif
 {-# INLINE toBE32' #-}
 
 fromBE32' :: Word32 -> Word32