diff --git a/shell.nix b/shell.nix
index 4e6c9584..b046ea2c 100644
--- a/shell.nix
+++ b/shell.nix
@@ -11,6 +11,7 @@ pkgs.stdenv.mkDerivation {
   buildInputs = project.env.nativeBuildInputs ++ [
     haskellPackages.cabal-install
     haskellPackages.fourmolu
+    haskellPackages.haskell-language-server
   ];
   LC_ALL = "C.UTF-8";
 }