diff --git a/.github/workflows/python-temporary-test.yml b/.github/workflows/python-temporary-test.yml
index fd2d6e9858..d8ad71cccc 100644
--- a/.github/workflows/python-temporary-test.yml
+++ b/.github/workflows/python-temporary-test.yml
@@ -16,7 +16,7 @@ jobs:
       uses: actions/checkout@v4
       with:
         repository: 'DataDog/system-tests'
-        branch: 'christophe-papazian/add_stderr_observability_for_nightly_on_standalone'
+        ref: 'christophe-papazian/add_stderr_observability_for_nightly_on_standalone'
     - name: Install runner
       uses: ./.github/actions/install_runner
     - name: Pull images