diff --git a/.github/workflows/base-tests.yaml b/.github/workflows/base-tests.yaml
index 855895aa..9ad2111e 100644
--- a/.github/workflows/base-tests.yaml
+++ b/.github/workflows/base-tests.yaml
@@ -32,7 +32,10 @@ jobs:
           HOMEBREW_NO_AUTO_UPDATE=1 brew install shellcheck
           HOMEBREW_NO_AUTO_UPDATE=1 brew install git-annex
           HOMEBREW_NO_AUTO_UPDATE=1 brew install bats-core
+          set -x
+          which docker || :
           sudo cp ci/dummy_docker /usr/local/bin/docker
+          which -a docker
 
       - name: Configure Git identity
         run: |