diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index 68d8994..2399c98 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -60,6 +60,7 @@ jobs:
         CRUFT_LOG: "${{ runner.temp }}/bob-installer-cruft.txt"
         CRUFT_MARKER: "${{ runner.temp }}/pre-install-marker"
       run: |
+        touch moocow
         find "$PWD" -newer "${CRUFT_MARKER}" > "${CRUFT_LOG}"
         if [ "$(wc -l < "${{ env.CRUFT_LOG }}" | xargs)" -gt 0 ]; then
           echo "::error::Unexpected files left in working directory"