diff --git a/CHANGELOG.markdown b/CHANGELOG.markdown
index 4ab7b25..370d1cc 100644
--- a/CHANGELOG.markdown
+++ b/CHANGELOG.markdown
@@ -1,3 +1,8 @@
+0.3.4
+=====
+
+  * Provided `hSize` on Windows. (https://github.com/biegunka/terminal-size/pull/18)
+
 0.3.3
 =====
 
diff --git a/default.nix b/default.nix
deleted file mode 100644
index 343ba12..0000000
--- a/default.nix
+++ /dev/null
@@ -1,2 +0,0 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc801" }:
-nixpkgs.pkgs.haskell.packages.${compiler}.callPackage ./package.nix {}
diff --git a/package.nix b/package.nix
deleted file mode 100644
index e9fbfc1..0000000
--- a/package.nix
+++ /dev/null
@@ -1,9 +0,0 @@
-{ mkDerivation, base, stdenv }:
-mkDerivation {
-  pname = "terminal-size";
-  version = "0.3.2.1";
-  src = ./.;
-  buildDepends = [ base ];
-  description = "Get terminal window height and width";
-  license = stdenv.lib.licenses.bsd3;
-}
diff --git a/shell.nix b/shell.nix
index 7424566..4320082 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,13 +1,13 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc801" }: let
-  inherit (nixpkgs) pkgs;
-  ghc = pkgs.haskell.packages.${compiler}.ghcWithPackages(ps: [
-    ps.hdevtools ps.hlint ps.ghc-mod
-  ]);
-  cabal-install = pkgs.haskell.packages.${compiler}.cabal-install;
-  pkg = (import ./default.nix { inherit nixpkgs compiler; });
-in
-  pkgs.stdenv.mkDerivation rec {
-    name = pkg.pname;
-    buildInputs = [ ghc cabal-install ] ++ pkg.env.buildInputs;
-    shellHook = "${pkg.env.shellHook}\nexport IN_WHICH_NIX_SHELL=${name}";
-  }
+{ pkgs ? import <nixpkgs> {}
+, ghc ? pkgs.haskell.compiler.ghc8107
+, stack ? pkgs.stack
+}:
+pkgs.mkShell {
+  buildInputs = with pkgs; [
+    ghc
+    stack
+  ];
+
+  shellHook = ''
+  '';
+}
diff --git a/terminal-size.cabal b/terminal-size.cabal
index 7ea4bd1..20cf0ad 100644
--- a/terminal-size.cabal
+++ b/terminal-size.cabal
@@ -1,5 +1,5 @@
 name:                terminal-size
-version:             0.3.3
+version:             0.3.4
 synopsis:            Get terminal window height and width
 description:
   Get terminal window height and width without ncurses dependency.
@@ -21,7 +21,7 @@ source-repository head
 source-repository this
   type:     git
   location: https://github.com/biegunka/terminal-size
-  tag:      0.3.3
+  tag:      0.3.4
 
 library
   default-language: