diff --git a/.github/workflows/pytest.yml b/.github/workflows/pytest.yml
index e1db6ce2..e87eccfb 100644
--- a/.github/workflows/pytest.yml
+++ b/.github/workflows/pytest.yml
@@ -256,6 +256,12 @@ jobs:
           fi
           
           echo "$HOME/.nix-profile/bin" >> $GITHUB_PATH
+      - name: Verify Nix package build
+        if: runner.os != 'Windows'  # Nix only supported on Linux/macOS
+        shell: bash
+        run: |
+          # Verify the flake builds successfully
+          nix build --no-link
       - name: Install uv
         shell: bash
         run: curl -LsSf https://astral.sh/uv/install.sh | sh
diff --git a/flake.nix b/flake.nix
index e92f1999..7529365b 100644
--- a/flake.nix
+++ b/flake.nix
@@ -50,7 +50,14 @@
         sourcePreference = "wheel"; # or sourcePreference = "sdist";
       };
 
-      pyprojectOverrides = _final: _prev: {};
+      pyprojectOverrides = final: prev: {
+        # Add setuptools for packages that need it during build
+        ruamel-yaml-clib = prev.ruamel-yaml-clib.overrideAttrs (old: {
+          nativeBuildInputs = (old.nativeBuildInputs or []) ++ [
+            final.setuptools
+          ];
+        });
+      };
 
       python = pkgs.python311;