diff --git a/shell.nix b/shell.nix
index df2997a61..c5b561eaa 100644
--- a/shell.nix
+++ b/shell.nix
@@ -1,4 +1,4 @@
-{ nixpkgs ? import <nixpkgs> {}, compiler ? null }:
+{ nixpkgs ? import <nixpkgs> {}, compiler ? "ghc802" }:
 
 let
   inherit (nixpkgs) pkgs;
@@ -22,7 +22,7 @@ let
   '';
 
   override = oldAttrs: {
-    nativeBuildInputs = oldAttrs.nativeBuildInputs ++ (with pkgs; [ postgresql ]) ++ (with haskellPackages; [ stack stack-run yesod-bin ]);
+    nativeBuildInputs = oldAttrs.nativeBuildInputs ++ (with pkgs; [ postgresql ]) ++ (with haskellPackages; [ stack yesod-bin ]);
     shellHook = ''
       ${oldAttrs.shellHook}
       export PROMPT_INFO="${oldAttrs.name}"
@@ -44,5 +44,10 @@ let
       exit ''${ret}
     '';
   };
-in
-  pkgs.stdenv.lib.overrideDerivation drv.env override
+
+  dummy = pkgs.stdenv.mkDerivation {
+    name = "interactive-uniworx-environment";
+    shellHook = "";
+  };
+in pkgs.stdenv.lib.overrideDerivation dummy override
+  #pkgs.stdenv.lib.overrideDerivation drv.env override
diff --git a/stack.nix b/stack.nix
index 6c8243ee9..720dc860f 100644
--- a/stack.nix
+++ b/stack.nix
@@ -5,7 +5,9 @@ let
 in haskell.lib.buildStackProject {
   inherit ghc;
   name = "stackenv";
-  buildInputs = with pkgs;
+  buildInputs = (with pkgs;
     [ postgresql zlib openldap cyrus_sasl.dev
-    ];
+    ]) ++ (with haskell.packages."ghc${builtins.replaceStrings ["."] [""] ghc.version}";
+    [ yesod-bin
+    ]);
 }