diff --git a/pkgs/development/libraries/haskell/unix-compat/default.nix b/pkgs/development/libraries/haskell/unix-compat/0.2.2.1.nix
similarity index 100%
rename from pkgs/development/libraries/haskell/unix-compat/default.nix
rename to pkgs/development/libraries/haskell/unix-compat/0.2.2.1.nix
diff --git a/pkgs/development/libraries/haskell/unix-compat/0.3.nix b/pkgs/development/libraries/haskell/unix-compat/0.3.nix
new file mode 100644
index 00000000000..da13c9313ac
--- /dev/null
+++ b/pkgs/development/libraries/haskell/unix-compat/0.3.nix
@@ -0,0 +1,17 @@
+{ cabal }:
+
+cabal.mkDerivation (self: {
+  pname = "unix-compat";
+  version = "0.3";
+  sha256 = "0zgz9s5z2kca37sgnf4dyfdw90435h20bznx485y1ggvh377jan7";
+  meta = {
+    homepage = "http://github.com/jystic/unix-compat";
+    description = "Portable POSIX-compatibility layer";
+    license = self.stdenv.lib.licenses.bsd3;
+    platforms = self.ghc.meta.platforms;
+    maintainers = [
+      self.stdenv.lib.maintainers.andres
+      self.stdenv.lib.maintainers.simons
+    ];
+  };
+})
diff --git a/pkgs/top-level/haskell-packages.nix b/pkgs/top-level/haskell-packages.nix
index 2cf554d5e9c..6f5fabe534c 100644
--- a/pkgs/top-level/haskell-packages.nix
+++ b/pkgs/top-level/haskell-packages.nix
@@ -1201,7 +1201,9 @@ let result = let callPackage = x : y : modifyPrio (newScope result.final x y);
 
   uniqueid = callPackage ../development/libraries/haskell/uniqueid {};
 
-  unixCompat = callPackage ../development/libraries/haskell/unix-compat {};
+  unixCompat_0_2_2_1 = callPackage ../development/libraries/haskell/unix-compat/0.2.2.1.nix {};
+  unixCompat_0_3 = callPackage ../development/libraries/haskell/unix-compat/0.3.nix {};
+  unixCompat = self.unixCompat_0_2_2_1;
 
   unorderedContainers = callPackage ../development/libraries/haskell/unordered-containers {};