diff --git a/pkgs/development/libraries/haskell/attoparsec-binary/attoparsec-binary-ghc7.6.1.patch b/pkgs/development/libraries/haskell/attoparsec-binary/attoparsec-binary-ghc7.6.1.patch
new file mode 100644
index 00000000000..dae949b2570
--- /dev/null
+++ b/pkgs/development/libraries/haskell/attoparsec-binary/attoparsec-binary-ghc7.6.1.patch
@@ -0,0 +1,20 @@
+diff --git a/Data/Attoparsec/Binary.hs b/Data/Attoparsec/Binary.hs
+index fab76c6..01d6c8b 100644
+--- a/Data/Attoparsec/Binary.hs
++++ b/Data/Attoparsec/Binary.hs
+@@ -23,7 +23,7 @@ import Data.Word
+ byteSize :: (Bits a) => a -> Int
+ byteSize = (`div` 8) . bitSize
+ 
+-pack :: (Bits a) => B.ByteString -> a
++pack :: (Bits a, Num a) => B.ByteString -> a
+ pack = B.foldl' (\n h -> (n `shiftL` 8) .|. fromIntegral h) 0
+ 
+ anyWordN :: (Bits a) => (B.ByteString -> a) -> Parser a
+@@ -84,4 +84,4 @@ word64be = wordN unpack
+ 
+ -- |Match a specific 64-bit little-endian word.
+ word64le :: Word64 -> Parser Word64
+-word64le = wordN $ B.reverse . unpack
+\ No newline at end of file
++word64le = wordN $ B.reverse . unpack
diff --git a/pkgs/development/libraries/haskell/attoparsec-binary/default.nix b/pkgs/development/libraries/haskell/attoparsec-binary/default.nix
index 1faea022e9a..f4e85d5ebd5 100644
--- a/pkgs/development/libraries/haskell/attoparsec-binary/default.nix
+++ b/pkgs/development/libraries/haskell/attoparsec-binary/default.nix
@@ -5,6 +5,7 @@ cabal.mkDerivation (self: {
   version = "0.1.0.1";
   sha256 = "1d3zjr8bh6d44v1vid0cvrrbyhn7xj4bn96vy36dzk7h7p87bzxa";
   buildDepends = [ attoparsec ];
+  patches = [ ./attoparsec-binary-ghc7.6.1.patch ];
   meta = {
     description = "Binary processing extensions to Attoparsec";
     license = self.stdenv.lib.licenses.bsd3;