diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index b2f22581..8424feb1 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -10,4 +10,4 @@ jobs:
       - uses: cachix/install-nix-action@v31
         with:
           github_access_token: ${{ secrets.GITHUB_TOKEN }}
-      - run: nix flake check
+      - run: nix flake check --impure