diff --git a/package.nix b/package.nix
index 1013558..2c2d70b 100644
--- a/package.nix
+++ b/package.nix
@@ -40,6 +40,6 @@ in
   app = hlib.justStaticExecutables hpkgs.stackage-server;
   shell = hpkgs.shellFor {
     packages = p: [ p.stackage-server ];
-    buildInputs = [ pkgs.cabal-install pkgs.haskell-language-server pkgs.ghcid ];
+    buildInputs = [ pkgs.cabal-install pkgs.haskell-language-server pkgs.ghcid pkgs.haskellPackages.yesod-bin ];
   };
 }