diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index bc1511b..87be1da 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -1,4 +1,5 @@
 name: Haskell CI
+
 on:
   pull_request:
   push:
@@ -15,4 +16,4 @@ jobs:
         with:
           name: dconf2nix
           signingKey: "${{ secrets.CACHIX_SIGNING_KEY }}"
-      - run: nix-build
+      - run: nix-shell --run "nix-build-uncached default.nix" ci.nix
diff --git a/ci.nix b/ci.nix
new file mode 100644
index 0000000..4fdb4f2
--- /dev/null
+++ b/ci.nix
@@ -0,0 +1,8 @@
+{ packages ? import ./pkgs.nix { inherit compiler; }, compiler ? "ghc884" }:
+
+let
+  inherit (packages) pkgs;
+in
+  pkgs.mkShell {
+    buildInputs = [ pkgs.nix-build-uncached ];
+  }