diff --git a/nix/overlay.nix b/nix/overlay.nix
index 921917e..ebe77a3 100644
--- a/nix/overlay.nix
+++ b/nix/overlay.nix
@@ -46,6 +46,7 @@ in
       buildInputs = [
         haskellPkgs.cabal-install
         haskellPkgs.ghcid
+        haskellPkgs.haskell-language-server
         super.docker-compose
         self.niv
         # self.releaser