diff --git a/cabal2nix.cabal b/cabal2nix.cabal
--- a/cabal2nix.cabal
+++ b/cabal2nix.cabal
@@ -1,5 +1,5 @@
 Name:                   cabal2nix
-Version:                1.6
+Version:                1.7
 Copyright:              (c) 2011 Peter Simons
 License:                BSD3
 License-File:           LICENSE
@@ -20,7 +20,7 @@
 			file. That path can be an HTTP URL or local file
 			path. For example:
 			.
-			> cabal2nix http://hackage.haskell.org/packages/archive/cabal2nix/1.6/cabal2nix.cabal
+			> cabal2nix http://hackage.haskell.org/packages/archive/cabal2nix/1.7/cabal2nix.cabal
 			> cabal2nix file:///tmp/cabal2nix.cabal
 			> cabal2nix /tmp/cabal2nix.cabal 0m7zgsd1pxmw504xpvl7dg25ana6dkk1mcyjj4c1wdbkvhvbn3gn
 			.
diff --git a/cabal2nix.hs b/cabal2nix.hs
--- a/cabal2nix.hs
+++ b/cabal2nix.hs
@@ -106,7 +106,10 @@
   | otherwise                   = readFile path
 
 hashPackage :: GenericPackageDescription -> IO String
-hashPackage pkg = readProcess "bash" ["-c", "exec nix-prefetch-url 2>/dev/tty " ++ url] ""
+hashPackage pkg = do
+    hash <- readProcess "bash" ["-c", "exec nix-prefetch-url 2>/dev/tty " ++ url] ""
+    return (reverse (dropWhile (=='\n') (reverse hash)))
+
   where
     url = "http://hackage.haskell.org/packages/archive/" ++ name ++ "/" ++ version ++ "/" ++ name ++ "-" ++ version ++ ".tar.gz"
     PackageIdentifier (PackageName name) version' = package (packageDescription pkg)