diff --git a/.github/workflows/delete-merged-caches.yml b/.github/workflows/delete-merged-caches.yml
index 2a63fe2e1..01c64cda5 100644
--- a/.github/workflows/delete-merged-caches.yml
+++ b/.github/workflows/delete-merged-caches.yml
@@ -15,6 +15,7 @@ jobs:
       - name: Cleanup
         env:
           GH_TOKEN: ${{ github.token }} # needed by the gh client
+          GH_REPO: ${{ github.repository }} # needed by the gh client
           BRANCH: refs/pull/${{ github.event.pull_request.number }}/merge
         run: |
           echo "Fetching list of cache keys"