diff --git a/.github/workflows/cleanup_pr.yml b/.github/workflows/cleanup_pr.yml
index 863a7a57bb3..51283cb3e7e 100644
--- a/.github/workflows/cleanup_pr.yml
+++ b/.github/workflows/cleanup_pr.yml
@@ -13,7 +13,7 @@ jobs:
     - name: Extract branch name
       id: extract_branch
       run: |
-        echo "##[set-output name=branch;]$(echo ${GITHUB_REF#refs/heads/})"
+        echo "##[set-output name=branch;]$(echo ${${{ github.event.pull_request.head.ref }}#refs/heads/})"
     - name: Delete folder on builds.jabref.org
       uses: appleboy/ssh-action@v0.0.6
       with: