diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
index 2ef285d..938a29b 100644
--- a/.github/workflows/build.yml
+++ b/.github/workflows/build.yml
@@ -43,6 +43,8 @@ jobs:
       - uses: ./.github/actions/nix
         with:
           attic_token: ${{ secrets.ATTIC_TOKEN }}
+          clean: true
+          btrfs: true
 
       - name: write lock file
         if: "${{ inputs.lockFile != '' }}"