diff --git a/.github/workflows/prune-branches.yml b/.github/workflows/prune-branches.yml
index 73a1e6a97bee..e65d428369fd 100644
--- a/.github/workflows/prune-branches.yml
+++ b/.github/workflows/prune-branches.yml
@@ -7,6 +7,7 @@ on:
   pull_request:
     paths:
      - .github/workflows/prune-branches.yml
+     - .github/workflows/prune-unused-branches.py
   schedule:
     - cron: '0 8 * * *' # Runs daily at 08:00 UTC.