diff --git a/shell.nix b/shell.nix
index aba56f4..7aaf2bc 100644
--- a/shell.nix
+++ b/shell.nix
@@ -2,5 +2,6 @@
 pkgs.mkShell {
   packages = with pkgs; [
     stack
+    haskell-language-server
   ];
 }