diff --git a/patching/patches/pwstore-fast-2.4.patch b/patching/patches/pwstore-fast-2.4.patch
new file mode 100644
index 00000000..1d0ed6bf
--- /dev/null
+++ b/patching/patches/pwstore-fast-2.4.patch
@@ -0,0 +1,47 @@
+diff -ru orig/Crypto/PasswordStore.hs new/Crypto/PasswordStore.hs
+--- orig/Crypto/PasswordStore.hs	2013-09-17 11:48:49.178111970 +0300
++++ new/Crypto/PasswordStore.hs	2013-09-17 11:48:49.000000000 +0300
+@@ -1,4 +1,5 @@
+ {-# LANGUAGE OverloadedStrings, BangPatterns #-}
++{-# LANGUAGE CPP #-}
+ -- |
+ -- Module      : Crypto.PasswordStore
+ -- Copyright   : (c) Peter Scott, 2011
+@@ -149,8 +150,8 @@
+            -> ByteString
+            -- ^ The encoded message
+ hmacSHA256 secret msg =
+-  let digest = SHA.hmacSha256 (BL.fromStrict secret) (BL.fromStrict msg)
+-    in BL.toStrict . SHA.bytestringDigest $ digest
++  let digest = SHA.hmacSha256 (fromStrict secret) (fromStrict msg)
++    in toStrict . SHA.bytestringDigest $ digest
+ 
+ -- | PBKDF2 key-derivation function.
+ -- For details see @http://tools.ietf.org/html/rfc2898@.
+@@ -403,3 +404,26 @@
+               where (a, g') = randomR ('\NUL', '\255') g
+           salt   = makeSalt $ B.pack $ map fst (rands gen 16)
+           newgen = snd $ last (rands gen 16)
++
++#if !MIN_VERSION_base(4, 6, 0)
++-- | Strict version of 'modifySTRef'
++modifySTRef' :: STRef s a -> (a -> a) -> ST s ()
++modifySTRef' ref f = do
++    x <- readSTRef ref
++    let x' = f x
++    x' `seq` writeSTRef ref x'
++#endif
++
++#if MIN_VERSION_bytestring(0, 10, 0)
++toStrict :: BL.ByteString -> BS.ByteString
++toStrict = BL.toStrict
++
++fromStrict :: BS.ByteString -> BL.ByteString
++fromStrict = BL.fromStrict
++#else
++toStrict :: BL.ByteString -> BS.ByteString
++toStrict = BS.concat . BL.toChunks
++
++fromStrict :: BS.ByteString -> BL.ByteString
++fromStrict = BL.fromChunks . return
++#endif