diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index c006e8f..1363a91 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -54,3 +54,12 @@ jobs:
         python -m pip install .[doc]
     - name: Build the documentation
       run: make -C doc html man
+
+  nix:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Install Nix
+      uses: cachix/install-nix-action@v20
+    - uses: actions/checkout@v3
+    - name: Build the nix derivation (also runs the tests)
+      run: nix build --print-build-logs
diff --git a/flake.nix b/flake.nix
index e388aab..f48e883 100644
--- a/flake.nix
+++ b/flake.nix
@@ -13,6 +13,9 @@
           cp -r $src/khard/data $out/lib/python*/site-packages/khard
         '';
         src = ./.;
+        pyproject = true;
+        doCheck = true;
+        checkPhase = "python -m unittest -v";
       });
     devShells.x86_64-linux.release =
       let pkgs = nixpkgs.legacyPackages.x86_64-linux; in