diff --git a/.github/workflows/nix.yml b/.github/workflows/nix.yml
index 4f38855d..4922d3f5 100644
--- a/.github/workflows/nix.yml
+++ b/.github/workflows/nix.yml
@@ -18,6 +18,8 @@ jobs:
       with:
         name: typhon
         authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
+    - name: Check formatting
+      run: nix run nixpkgs#alejandra -- -c .
     - name: Build typhon
       run: nix build -L
     - name: Build typhon-webapp