diff --git a/.github/actions/checkout/action.yml b/.github/actions/checkout/action.yml
index e786b06..d3e9493 100644
--- a/.github/actions/checkout/action.yml
+++ b/.github/actions/checkout/action.yml
@@ -7,9 +7,10 @@ runs:
 
   steps:
     - uses: DeterminateSystems/nix-installer-action@v6
-
     - uses: DeterminateSystems/magic-nix-cache-action@v2
-
+    - uses: DeterminateSystems/flake-checker-action@v5
+    - name: actually build nix
+      run: nix build .
     - uses: HatsuneMiku3939/direnv-action@v1.0.2
       with:
         direnvVersion: 2.32.3
diff --git a/.github/workflows/mdbook-deploy.yml b/.github/workflows/mdbook-deploy.yml
index 3773286..deff34d 100644
--- a/.github/workflows/mdbook-deploy.yml
+++ b/.github/workflows/mdbook-deploy.yml
@@ -20,9 +20,6 @@ jobs:
       - name: Checkout `carrie` (we hope)
         uses: ./.github/actions/checkout
 
-      - name: misc
-        run: ls /home/runner/.nix-profile/bin/
-
       - name: Build docs
         run: mdbook build