diff --git a/.github/scripts/apidoc.sh b/.github/scripts/apidoc.sh
index 5694c1616..40a03c1a8 100755
--- a/.github/scripts/apidoc.sh
+++ b/.github/scripts/apidoc.sh
@@ -146,7 +146,7 @@ if [ "$BRANCH" != "gh-pages" ]; then
     COMPARE_LINKS="$COMPARE_LINKS\nComparison against master (gh-pages): https://github.com/awesomeWM/apidoc/compare/gh-pages...${NEW_REV}"
 fi
 # shellcheck disable=SC2028
-echo "Compare links:\n$COMPARE_LINKS"
+printf %s "Compare links:\n$COMPARE_LINKS"
 
 # Post a comment to the PR.
 if [ "$PR_NUMBER" != false ]; then
diff --git a/.github/workflows/main.yml b/.github/workflows/main.yml
index d0fe4b820..a3b46962d 100644
--- a/.github/workflows/main.yml
+++ b/.github/workflows/main.yml
@@ -324,7 +324,7 @@ jobs:
           luacov-coveralls \
             --verbose \
             --merge \
-            --repo-token ${{ secrets.COVERALLS_REPO_TOKEN }} \
+            --repo-token ${{ secrets.COVERALLS_REPO_TOKEN || github.token }} \
             --service-name ""
 
       # `check-qa` is the only test that doesn't get a coverage report, so it has to run after all of that.
@@ -336,12 +336,13 @@ jobs:
       - name: Test previous commits
         if: matrix.test_prev_commits && github.event_name == 'pull_request'
         run: |
+          git remote add fork "${{ github.event.pull_request.head.repo.git_url }}"
           # `actions/checkout` creates a shallow repo (`--depth 1`) by default,
           # which is fine for everything up until now. But we need individual commits now.
           # And we only want to unshallow now, to not slow down the checkout for other jobs.
-          git fetch --unshallow
+          git fetch --unshallow --all
 
-          rev_list="$(git rev-list --bisect-all origin/${{ github.base_ref }}..origin/${{ github.head_ref }})"
+          rev_list="$(git rev-list --bisect-all origin/${{ github.base_ref }}..fork/${{ github.head_ref }})"
           commits="$(echo "$rev_list" | grep -v 'dist=0' | cut -d' ' -f 1)"
           n="$(echo "$commits" | wc -l)"