diff --git a/.github/workflows/check.yml b/.github/workflows/check.yml
index 8727db2..ca13499 100644
--- a/.github/workflows/check.yml
+++ b/.github/workflows/check.yml
@@ -8,6 +8,7 @@ jobs:
     runs-on: "ubuntu-22.04"
     steps:
       - uses: "actions/checkout@v4"
+      - uses: "DeterminateSystems/flake-checker-action@main"
       - uses: "DeterminateSystems/nix-installer-action@main"
       - uses: "DeterminateSystems/magic-nix-cache-action@main"
       - name: Flake check