diff --git a/package.nix b/package.nix
index 2c2d70b..d00005d 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 pkgs.haskellPackages.yesod-bin ];
+    buildInputs = [ pkgs.cabal-install pkgs.haskell-language-server pkgs.ghcid pkgs.haskellPackages.yesod-bin pkgs.postgresql ];
   };
 }
diff --git a/shell.nix b/shell.nix
new file mode 100644
index 0000000..8cb1fc7
--- /dev/null
+++ b/shell.nix
@@ -0,0 +1,7 @@
+(import (
+  fetchGit {
+    url = "https://github.com/edolstra/flake-compat";
+  }
+) {
+  src =  ./.;
+}).shellNix
diff --git a/stack.yaml b/stack.yaml
index a63ea85..fff6c83 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -30,8 +30,4 @@ allow-newer-deps:
   - pantry
 
 nix:
-  packages:
-    - zlib
-    - postgresql
-    - pkg-config
-    - cacert
+  shell-file: shell.nix