diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index c782e92e..93b66588 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -13,5 +13,7 @@ jobs:
         uses: actions/checkout@v3
       - name: Install Nix
         uses: DeterminateSystems/nix-installer-action@main
+      - name: Check Nix flake inputs
+        uses: DeterminateSystems/flake-checker-action@v4
       - run: nix -L build
         working-directory: ./code/hsec-tools