diff --git a/Data/ByteArray/Bytes.hs b/Data/ByteArray/Bytes.hs
index 5610fbe..16f8690 100644
--- a/Data/ByteArray/Bytes.hs
+++ b/Data/ByteArray/Bytes.hs
@@ -28,6 +28,7 @@ import           Data.Foldable (toList)
 #else
 import           Data.Monoid
 #endif
+import           Data.Memory.HeadHackageUtils
 import           Data.Memory.PtrMethods
 import           Data.Memory.Internal.Imports
 import           Data.Memory.Internal.CompatPrim
@@ -149,7 +150,7 @@ bytesEq b1@(Bytes m1) b2@(Bytes m2)
             case readWord8Array# m1 i s of
                 (# s', e1 #) -> case readWord8Array# m2 i s' of
                     (# s'', e2 #) ->
-                        if booleanPrim (eqWord# e1 e2)
+                        if booleanPrim (eqWord# (word8ToWordCompat# e1) (word8ToWordCompat# e2))
                             then loop (i +# 1#) s''
                             else (# s'', False #)
     {-# INLINE loop #-}
@@ -171,9 +172,9 @@ bytesCompare b1@(Bytes m1) b2@(Bytes m2) = unsafeDoIO $ IO $ \s -> loop 0# s
             case readWord8Array# m1 i s1 of
                 (# s2, e1 #) -> case readWord8Array# m2 i s2 of
                     (# s3, e2 #) ->
-                        if booleanPrim (eqWord# e1 e2)
+                        if booleanPrim (eqWord# (word8ToWordCompat# e1) (word8ToWordCompat# e2))
                             then loop (i +# 1#) s3
-                            else if booleanPrim (ltWord# e1 e2) then (# s3, LT #)
+                            else if booleanPrim (ltWord# (word8ToWordCompat# e1) (word8ToWordCompat# e2)) then (# s3, LT #)
                                                                 else (# s3, GT #)
 
 bytesUnpackChars :: Bytes -> String -> String
@@ -202,7 +203,7 @@ bytesUnpackChars (Bytes mba) xs = chunkLoop 0#
     rChar :: Int# -> IO Char
     rChar idx = IO $ \s ->
         case readWord8Array# mba idx s of
-            (# s2, w #) -> (# s2, C# (chr# (word2Int# w)) #)
+            (# s2, w #) -> (# s2, C# (chr# (word2Int# (word8ToWordCompat# w))) #)
 
 {-
 bytesShowHex :: Bytes -> String
diff --git a/Data/ByteArray/ScrubbedBytes.hs b/Data/ByteArray/ScrubbedBytes.hs
index 41c7ca6..5c2ef60 100644
--- a/Data/ByteArray/ScrubbedBytes.hs
+++ b/Data/ByteArray/ScrubbedBytes.hs
@@ -28,6 +28,7 @@ import           Data.Monoid
 #endif
 import           Data.String (IsString(..))
 import           Data.Typeable
+import           Data.Memory.HeadHackageUtils
 import           Data.Memory.PtrMethods
 import           Data.Memory.Internal.CompatPrim
 import           Data.Memory.Internal.Compat     (unsafeDoIO)
@@ -188,9 +189,9 @@ scrubbedBytesCompare b1@(ScrubbedBytes m1) b2@(ScrubbedBytes m2) = unsafeDoIO $
             case readWord8Array# m1 i s1 of
                 (# s2, e1 #) -> case readWord8Array# m2 i s2 of
                     (# s3, e2 #) ->
-                        if booleanPrim (eqWord# e1 e2)
+                        if booleanPrim (eqWord# (word8ToWordCompat# e1) (word8ToWordCompat# e2))
                             then loop (i +# 1#) s3
-                            else if booleanPrim (ltWord# e1 e2) then (# s3, LT #)
+                            else if booleanPrim (ltWord# (word8ToWordCompat# e1) (word8ToWordCompat# e2)) then (# s3, LT #)
                                                                 else (# s3, GT #)
 
 scrubbedFromChar8 :: [Char] -> ScrubbedBytes
diff --git a/Data/Memory/Encoding/Base16.hs b/Data/Memory/Encoding/Base16.hs
index fd230ec..8bd03a7 100644
--- a/Data/Memory/Encoding/Base16.hs
+++ b/Data/Memory/Encoding/Base16.hs
@@ -21,6 +21,7 @@ module Data.Memory.Encoding.Base16
     , fromHexadecimal
     ) where
 
+import           Data.Memory.HeadHackageUtils
 import           Data.Memory.Internal.Compat
 import           Data.Word
 import           Data.Bits ((.|.))
@@ -32,7 +33,7 @@ import           Foreign.Storable
 import           Foreign.Ptr (Ptr)
 
 -- | Transform a raw memory to an hexadecimal 'String'
--- 
+--
 -- user beware, no checks are made
 showHexadecimal :: (forall a . (Ptr Word8 -> IO a) -> IO a) -- ^ a 'with' type of function to hold reference to the object
                 -> Int    -- ^ length in bytes
@@ -43,10 +44,10 @@ showHexadecimal withPtr = doChunks 0
             | len < 4   = doUnique ofs len
             | otherwise = do
                 let !(W8# a, W8# b, W8# c, W8# d) = unsafeDoIO $ withPtr (read4 ofs)
-                    !(# w1, w2 #) = convertByte a
-                    !(# w3, w4 #) = convertByte b
-                    !(# w5, w6 #) = convertByte c
-                    !(# w7, w8 #) = convertByte d
+                    !(# w1, w2 #) = convertByte (word8ToWordCompat# a)
+                    !(# w3, w4 #) = convertByte (word8ToWordCompat# b)
+                    !(# w5, w6 #) = convertByte (word8ToWordCompat# c)
+                    !(# w7, w8 #) = convertByte (word8ToWordCompat# d)
                  in wToChar w1 : wToChar w2 : wToChar w3 : wToChar w4
                   : wToChar w5 : wToChar w6 : wToChar w7 : wToChar w8
                   : doChunks (ofs + 4) (len - 4)
@@ -55,7 +56,7 @@ showHexadecimal withPtr = doChunks 0
             | len == 0  = []
             | otherwise =
                 let !(W8# b)      = unsafeDoIO $ withPtr (byteIndex ofs)
-                    !(# w1, w2 #) = convertByte b
+                    !(# w1, w2 #) = convertByte (word8ToWordCompat# b)
                  in wToChar w1 : wToChar w2 : doUnique (ofs + 1) (len - 1)
 
         read4 :: Int -> Ptr Word8 -> IO (Word8, Word8, Word8, Word8)
@@ -82,9 +83,9 @@ toHexadecimal bout bin n = loop 0
             | i == n  = return ()
             | otherwise = do
                 (W8# w) <- peekByteOff bin i
-                let !(# w1, w2 #) = convertByte w
-                pokeByteOff bout (i * 2)     (W8# w1)
-                pokeByteOff bout (i * 2 + 1) (W8# w2)
+                let !(# w1, w2 #) = convertByte (word8ToWordCompat# w)
+                pokeByteOff bout (i * 2)     (W8# (wordToWord8Compat# w1))
+                pokeByteOff bout (i * 2 + 1) (W8# (wordToWord8Compat# w2))
                 loop (i+1)
 
 -- | Convert a value Word# to two Word#s containing
@@ -93,7 +94,7 @@ convertByte :: Word# -> (# Word#, Word# #)
 convertByte b = (# r tableHi b, r tableLo b #)
   where
         r :: Addr# -> Word# -> Word#
-        r table index = indexWord8OffAddr# table (word2Int# index)
+        r table index = word8ToWordCompat# (indexWord8OffAddr# table (word2Int# index))
 
         !tableLo =
             "0123456789abcdef0123456789abcdef\
@@ -131,9 +132,9 @@ fromHexadecimal dst src n
                     then return $ Just i
                     else pokeByteOff dst di (a .|. b) >> loop (di+1) (i+2)
 
-        rLo (W8# index) = W8# (indexWord8OffAddr# tableLo (word2Int# index))
-        rHi (W8# index) = W8# (indexWord8OffAddr# tableHi (word2Int# index))
-        
+        rLo (W8# index) = W8# (indexWord8OffAddr# tableLo (word2Int# (word8ToWordCompat# index)))
+        rHi (W8# index) = W8# (indexWord8OffAddr# tableHi (word2Int# (word8ToWordCompat# index)))
+
         !tableLo =
                 "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
                  \\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
diff --git a/Data/Memory/Encoding/Base32.hs b/Data/Memory/Encoding/Base32.hs
index 9f492a2..947c658 100644
--- a/Data/Memory/Encoding/Base32.hs
+++ b/Data/Memory/Encoding/Base32.hs
@@ -21,6 +21,7 @@ module Data.Memory.Encoding.Base32
     , fromBase32
     ) where
 
+import           Data.Memory.HeadHackageUtils
 import           Data.Memory.Internal.Compat
 import           Data.Memory.Internal.CompatPrim
 import           Data.Word
@@ -88,21 +89,21 @@ toBase32Per5Bytes (W8# i1, W8# i2, W8# i3, W8# i4, W8# i5) =
     (index o1, index o2, index o3, index o4, index o5, index o6, index o7, index o8)
   where
     -- 1111 1000 >> 3
-    !o1 =     (uncheckedShiftRL# (and# i1 0xF8##) 3#)
+    !o1 =     (uncheckedShiftRL# (and# (word8ToWordCompat# i1) 0xF8##) 3#)
     -- 0000 0111 << 2 | 1100 0000 >> 6
-    !o2 = or# (uncheckedShiftL#  (and# i1 0x07##) 2#) (uncheckedShiftRL# (and# i2 0xC0##) 6#)
+    !o2 = or# (uncheckedShiftL#  (and# (word8ToWordCompat# i1) 0x07##) 2#) (uncheckedShiftRL# (and# (word8ToWordCompat# i2) 0xC0##) 6#)
     -- 0011 1110 >> 1
-    !o3 =     (uncheckedShiftRL# (and# i2 0x3E##) 1#)
+    !o3 =     (uncheckedShiftRL# (and# (word8ToWordCompat# i2) 0x3E##) 1#)
     -- 0000 0001 << 4 | 1111 0000 >> 4
-    !o4 = or# (uncheckedShiftL#  (and# i2 0x01##) 4#) (uncheckedShiftRL# (and# i3 0xF0##) 4#)
+    !o4 = or# (uncheckedShiftL#  (and# (word8ToWordCompat# i2) 0x01##) 4#) (uncheckedShiftRL# (and# (word8ToWordCompat# i3) 0xF0##) 4#)
     -- 0000 1111 << 1 | 1000 0000 >> 7
-    !o5 = or# (uncheckedShiftL#  (and# i3 0x0F##) 1#) (uncheckedShiftRL# (and# i4 0x80##) 7#)
+    !o5 = or# (uncheckedShiftL#  (and# (word8ToWordCompat# i3) 0x0F##) 1#) (uncheckedShiftRL# (and# (word8ToWordCompat# i4) 0x80##) 7#)
     -- 0111 1100 >> 2
-    !o6 =     (uncheckedShiftRL# (and# i4 0x7C##) 2#)
+    !o6 =     (uncheckedShiftRL# (and# (word8ToWordCompat# i4) 0x7C##) 2#)
     -- 0000 0011 << 3 | 1110 0000 >> 5
-    !o7 = or# (uncheckedShiftL#  (and# i4 0x03##) 3#) (uncheckedShiftRL# (and# i5 0xE0##) 5#)
+    !o7 = or# (uncheckedShiftL#  (and# (word8ToWordCompat# i4) 0x03##) 3#) (uncheckedShiftRL# (and# (word8ToWordCompat# i5) 0xE0##) 5#)
     -- 0001 1111
-    !o8 =     ((and# i5 0x1F##))
+    !o8 =     ((and# (word8ToWordCompat# i5) 0x1F##))
 
     !set = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"#
 
@@ -235,8 +236,8 @@ fromBase32Per8Bytes (i1, i2, i3, i4, i5, i6, i7, i8) =
   where
     rset :: Word8 -> Word8
     rset (W8# w)
-        | booleanPrim (w `leWord#` 0xff##) = W8# (indexWord8OffAddr# rsetTable (word2Int# w))
-        | otherwise                        = 0xff
+        | booleanPrim (word8ToWordCompat# w `leWord#` 0xff##)
+                                           = W8# (indexWord8OffAddr# rsetTable (word2Int# (word8ToWordCompat# w)))
 
     !rsetTable = "\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\
                  \\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\xFF\
diff --git a/Data/Memory/Encoding/Base64.hs b/Data/Memory/Encoding/Base64.hs
index 9803875..659c07f 100644
--- a/Data/Memory/Encoding/Base64.hs
+++ b/Data/Memory/Encoding/Base64.hs
@@ -26,6 +26,7 @@ module Data.Memory.Encoding.Base64
     , fromBase64OpenBSD
     ) where
 
+import           Data.Memory.HeadHackageUtils
 import           Data.Memory.Internal.Compat
 import           Data.Memory.Internal.CompatPrim
 import           Data.Memory.Internal.Imports
@@ -92,10 +93,10 @@ toBase64Internal table dst src len padded = loop 0 0
 
 convert3 :: Addr# -> Word8 -> Word8 -> Word8 -> (Word8, Word8, Word8, Word8)
 convert3 table (W8# a) (W8# b) (W8# c) =
-    let !w = narrow8Word# (uncheckedShiftRL# a 2#)
-        !x = or# (and# (uncheckedShiftL# a 4#) 0x30##) (uncheckedShiftRL# b 4#)
-        !y = or# (and# (uncheckedShiftL# b 2#) 0x3c##) (uncheckedShiftRL# c 6#)
-        !z = and# c 0x3f##
+    let !w = narrow8Word# (uncheckedShiftRL# (word8ToWordCompat# a) 2#)
+        !x = or# (and# (uncheckedShiftL# (word8ToWordCompat# a) 4#) 0x30##) (uncheckedShiftRL# (word8ToWordCompat# b) 4#)
+        !y = or# (and# (uncheckedShiftL# (word8ToWordCompat# b) 2#) 0x3c##) (uncheckedShiftRL# (word8ToWordCompat# c) 6#)
+        !z = and# (word8ToWordCompat# c) 0x3f##
      in (index w, index x, index y, index z)
   where
         index :: Word# -> Word8
@@ -211,7 +212,8 @@ fromBase64Unpadded rset dst src len = loop 0 0
 
 rsetURL :: Word8 -> Word8
 rsetURL (W8# w)
-    | booleanPrim (w `leWord#` 0xff##) = W8# (indexWord8OffAddr# rsetTable (word2Int# w))
+    | booleanPrim (word8ToWordCompat# w `leWord#` 0xff##)
+                                       = W8# (indexWord8OffAddr# rsetTable (word2Int# (word8ToWordCompat# w)))
     | otherwise                        = 0xff
   where !rsetTable = "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
                      \\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
@@ -232,7 +234,8 @@ rsetURL (W8# w)
 
 rsetOpenBSD :: Word8 -> Word8
 rsetOpenBSD (W8# w)
-    | booleanPrim (w `leWord#` 0xff##) = W8# (indexWord8OffAddr# rsetTable (word2Int# w))
+    | booleanPrim (word8ToWordCompat# w `leWord#` 0xff##)
+                                       = W8# (indexWord8OffAddr# rsetTable (word2Int# (word8ToWordCompat# w)))
     | otherwise                        = 0xff
   where !rsetTable = "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
                      \\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
@@ -309,7 +312,8 @@ fromBase64 dst src len
 
         rset :: Word8 -> Word8
         rset (W8# w)
-            | booleanPrim (w `leWord#` 0xff##) = W8# (indexWord8OffAddr# rsetTable (word2Int# w))
+            | booleanPrim (word8ToWordCompat# w `leWord#` 0xff##)
+                                               = W8# (indexWord8OffAddr# rsetTable (word2Int# (word8ToWordCompat# w)))
             | otherwise                        = 0xff
 
         !rsetTable = "\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\xff\
diff --git a/Data/Memory/Hash/FNV.hs b/Data/Memory/Hash/FNV.hs
index 89d78b5..be572a7 100644
--- a/Data/Memory/Hash/FNV.hs
+++ b/Data/Memory/Hash/FNV.hs
@@ -8,6 +8,7 @@
 -- Fowler Noll Vo Hash (1 and 1a / 32 / 64 bits versions)
 -- <http://en.wikipedia.org/wiki/Fowler%E2%80%93Noll%E2%80%93Vo_hash_function>
 --
+{-# LANGUAGE CPP                        #-}
 {-# LANGUAGE GeneralizedNewtypeDeriving #-}
 {-# LANGUAGE MagicHash                  #-}
 {-# LANGUAGE UnboxedTuples              #-}
@@ -24,12 +25,17 @@ module Data.Memory.Hash.FNV
     , fnv1a_64
     ) where
 
+import           Data.Memory.HeadHackageUtils
 import           Data.Memory.Internal.Compat ()
 import           Data.Memory.Internal.CompatPrim
 import           Data.Memory.Internal.CompatPrim64
 import           Data.Memory.Internal.Imports
 import           GHC.Word
-import           GHC.Prim hiding (Word64#, Int64#)
+import           GHC.Prim hiding ( Word64#, Int64#
+#if __GLASGOW_HASKELL__ >= 903
+                                 , timesWord64#, xor64#, wordToWord64#
+#endif
+                                 )
 import           GHC.Types
 import           GHC.Ptr
 
@@ -44,40 +50,40 @@ newtype FnvHash64 = FnvHash64 Word64
 -- | compute FNV1 (32 bit variant) of a raw piece of memory
 fnv1 :: Ptr Word8 -> Int -> IO FnvHash32
 fnv1 (Ptr addr) (I# n) = IO $ \s -> loop 0x811c9dc5## 0# s
-  where 
+  where
         loop :: Word# -> Int# -> State# s -> (# State# s, FnvHash32 #)
         loop !acc i s
-            | booleanPrim (i ==# n) = (# s, FnvHash32 $ W32# (narrow32Word# acc) #)
+            | booleanPrim (i ==# n) = (# s, FnvHash32 $ W32# (narrow32WordCompat# acc) #)
             | otherwise             =
                 case readWord8OffAddr# addr i s of
                     (# s2, v #) ->
-                        let !nacc = (0x01000193## `timesWord#` acc) `xor#` v
+                        let !nacc = (0x01000193## `timesWord#` acc) `xor#` word8ToWordCompat# v
                          in loop nacc (i +# 1#) s2
 
 -- | compute FNV1a (32 bit variant) of a raw piece of memory
 fnv1a :: Ptr Word8 -> Int -> IO FnvHash32
 fnv1a (Ptr addr) (I# n) = IO $ \s -> loop 0x811c9dc5## 0# s
-  where 
+  where
         loop :: Word# -> Int# -> State# s -> (# State# s, FnvHash32 #)
         loop !acc i s
-            | booleanPrim (i ==# n) = (# s, FnvHash32 $ W32# (narrow32Word# acc) #)
+            | booleanPrim (i ==# n) = (# s, FnvHash32 $ W32# (narrow32WordCompat# acc) #)
             | otherwise             =
                 case readWord8OffAddr# addr i s of
                     (# s2, v #) ->
-                        let !nacc = 0x01000193## `timesWord#` (acc `xor#` v)
+                        let !nacc = 0x01000193## `timesWord#` (acc `xor#` word8ToWordCompat# v)
                          in loop nacc (i +# 1#) s2
 
 -- | compute FNV1 (64 bit variant) of a raw piece of memory
 fnv1_64 :: Ptr Word8 -> Int -> IO FnvHash64
 fnv1_64 (Ptr addr) (I# n) = IO $ \s -> loop fnv64Const 0# s
-  where 
+  where
         loop :: Word64# -> Int# -> State# s -> (# State# s, FnvHash64 #)
         loop !acc i s
             | booleanPrim (i ==# n) = (# s, FnvHash64 $ W64# acc #)
             | otherwise             =
                 case readWord8OffAddr# addr i s of
                     (# s2, v #) ->
-                        let !nacc = (fnv64Prime `timesWord64#` acc) `xor64#` (wordToWord64# v)
+                        let !nacc = (fnv64Prime `timesWord64#` acc) `xor64#` (wordToWord64# (word8ToWordCompat# v))
                          in loop nacc (i +# 1#) s2
 
         fnv64Const :: Word64#
@@ -89,14 +95,14 @@ fnv1_64 (Ptr addr) (I# n) = IO $ \s -> loop fnv64Const 0# s
 -- | compute FNV1a (64 bit variant) of a raw piece of memory
 fnv1a_64 :: Ptr Word8 -> Int -> IO FnvHash64
 fnv1a_64 (Ptr addr) (I# n) = IO $ \s -> loop fnv64Const 0# s
-  where 
+  where
         loop :: Word64# -> Int# -> State# s -> (# State# s, FnvHash64 #)
         loop !acc i s
             | booleanPrim (i ==# n) = (# s, FnvHash64 $ W64# acc #)
             | otherwise             =
                 case readWord8OffAddr# addr i s of
                     (# s2, v #) ->
-                        let !nacc = fnv64Prime `timesWord64#` (acc `xor64#` wordToWord64# v)
+                        let !nacc = fnv64Prime `timesWord64#` (acc `xor64#` wordToWord64# (word8ToWordCompat# v))
                          in loop nacc (i +# 1#) s2
 
         fnv64Const :: Word64#
diff --git a/Data/Memory/HeadHackageUtils.hs b/Data/Memory/HeadHackageUtils.hs
new file mode 100644
index 0000000..d6ab707
--- /dev/null
+++ b/Data/Memory/HeadHackageUtils.hs
@@ -0,0 +1,35 @@
+{-# LANGUAGE CPP #-}
+{-# LANGUAGE MagicHash #-}
+module Data.Memory.HeadHackageUtils where
+
+import GHC.Exts
+
+#if MIN_VERSION_base(4,16,0)
+word8ToWordCompat# :: Word8# -> Word#
+word8ToWordCompat# = word8ToWord#
+
+wordToWord8Compat# :: Word# -> Word8#
+wordToWord8Compat# = wordToWord8#
+
+wordToWord32Compat# :: Word# -> Word32#
+wordToWord32Compat# = wordToWord32#
+
+--
+
+narrow32WordCompat# :: Word# -> Word32#
+narrow32WordCompat# = wordToWord32#
+#else
+-- No-ops
+word8ToWordCompat# :: Word# -> Word#
+word8ToWordCompat# x = x
+
+wordToWord8Compat# :: Word# -> Word#
+wordToWord8Compat# x = x
+
+wordToWord32Compat# :: Word# -> Word#
+wordToWord32Compat# x = x
+
+-- Actual narrowing
+narrow32WordCompat# :: Word# -> Word#
+narrow32WordCompat# = narrow32Word#
+#endif
diff --git a/Data/Memory/Internal/CompatPrim64.hs b/Data/Memory/Internal/CompatPrim64.hs
index b6d2bd7..c16a9dd 100644
--- a/Data/Memory/Internal/CompatPrim64.hs
+++ b/Data/Memory/Internal/CompatPrim64.hs
@@ -52,8 +52,44 @@ module Data.Memory.Internal.CompatPrim64
 
 
 #if WORD_SIZE_IN_BITS == 64
-import GHC.Prim hiding (Word64#, Int64#)
+#if __GLASGOW_HASKELL__ >= 903
+import GHC.Prim
+#else
+import GHC.Prim hiding ( Word64#, Int64#
+                       , eqInt64#
+                       , neInt64#
+                       , ltInt64#
+                       , leInt64#
+                       , gtInt64#
+                       , geInt64#
+                       , quotInt64#
+                       , remInt64#
+                       , eqWord64#
+                       , neWord64#
+                       , ltWord64#
+                       , leWord64#
+                       , gtWord64#
+                       , geWord64#
+                       , and64#
+                       , or64#
+                       , xor64#
+                       , not64#
+                       , timesWord64#
+                       , uncheckedShiftL64#
+                       , uncheckedShiftRL64#
+                       , int64ToWord64#
+                       , word64ToInt64#
+                       , intToInt64#
+                       , int64ToInt#
+                       , wordToWord64#
+                       , word64ToWord#
+                       )
+#endif
 
+#if __GLASGOW_HASKELL__ >= 903
+w64# :: Word# -> Word# -> Word# -> Word64#
+w64# w _ _ = wordToWord64# w
+#else
 #if __GLASGOW_HASKELL__ >= 708
 type OutBool = Int#
 #else
@@ -146,6 +182,7 @@ timesWord64# = timesWord#
 
 w64# :: Word# -> Word# -> Word# -> Word64#
 w64# w _ _ = w
+#endif
 
 #elif WORD_SIZE_IN_BITS == 32
 import GHC.IntWord64
diff --git a/memory.cabal b/memory.cabal
index 2db3f39..eec3b16 100644
--- a/memory.cabal
+++ b/memory.cabal
@@ -72,6 +72,7 @@ Library
                      Data.Memory.Internal.Imports
                      Data.Memory.Hash.SipHash
                      Data.Memory.Hash.FNV
+                     Data.Memory.HeadHackageUtils
                      Data.ByteArray.Pack.Internal
                      Data.ByteArray.Types
                      Data.ByteArray.Bytes